A Changelog for this post:
08/08/2020: Updated, added "Questions 1". Noted that I don't have a "Verbs 1", will focus on getting that done. (Since I started doing this late in the course, some of the later modules are more complete than the early ones).
Changelog 8/16/2020
Added most of the Verbs 1 module. Think I've finished most of Questions 1.
Changelog 8/23/2020
Probably almost completed the Verbs 1 module, adding other links when encountered.
Changelog 8/30/2020
Added more exercises from the early modules, such as Basics 1 and 2, Alphabet 1 and 2, Prepositions 2.
Changelog 09/07/2020
Added exercises to Time, Conjunctions, Nominalize, Modals, Country 1, and Past. Removed a couple of duplicates.
Changelog 09/14/2020
Added links to Modals, Attributes, Clothing, Dem Deter, Food, and Travel.
Changelog 09/20/2020
Added links to Abstract Objects 1, Abstract Objects 2, Alphabet 2, Animals 2, Clothing, Colors, Country 2, Determinative, Family, Geography, Miscellaneous, Nominalize, Objects 2, People, Places, Plurals, Politics, Possession, Verbs 2.5, and Verbs 4.
Unfortunately, I'm seeing that some links do appear to be permanently broken, no matter which way I try to access them. That's unfortunate as you can't report a problem (say, in on exercise, the hint is completely blank) fully without accessing the discussion page. More on that later.
Changelog 09/29/2020
Added links to Communications, Jobs, Nature, Negation, Objects 2, Phrases 2, Plurals, Politics, Possession, and Time 2.
Changelong 10/05/2020
Started a new module, Classifiers 2. Added links to Adjectives 1.5, Animals 2, Arts, and Determinative.
Changelog 10/18/2020
Added more links to Classifiers 2 and finished all 5 levels of the module.
Changelog 10/27/2020
Added links to Classifiers 2, Alphabet 2, Continuous, and Phrases 3.
Changelog 12/07/2020
Had interruptions to updating this (had CoVID, among other things): As I rearranged some of the folders, it changed the dates so I can't give a changelog, but no new modules were added.
Changelog 01/04/2021
Added "Jobs 2", and started to add "Medical" though it's probably not complete. Added items to Adjectives 2, Geography, Plurals, and Politics.
01/11/2021
Added items to Medical.
01/19/2021
Added more items to Medical.
Changelog 02/01/2021
Began to add a new module, "Science".
I'm seeing in the mobile Duolingo exercises some exercises that don't show in the web version. If I can get the links to those, I'll start adding them as well.
Changelog 02/08/2021
Added more items to "Science".
I have been having problems with Firefox of late, sometimes the discussion pages load, sometimes they don't; the behavior is erratic. That calls into question two of the links I put in as "broken".
I am also including links the Duolingo Vocabulary pages where there is no apparent link for a sentence; at least readers can see the preferred translation that way.
Changelog 02-15-2021
Added more items to "Science"; added more to "Verbs 4". I am trying to see if I can add stuff from the mobile version of DL but at times those don't seem to show up in web searches. Also, I have to be at the computer while using my phone in order to do this.
Changelog 02-24-2021
Added items to: Science, Medical, Animals 2, Verbs 2, Places, and Nature. I am finding out when I use the Duolingo Mobile version I'm running into more/different links that are present in the web, but just not frequently encountered.
However, I'm also finding exercises like these in the mobile (In "Past"):
She danced for one hundred and six minutes
cô ấy nhảy trong một trăm sáu phút
That don't seem to have any version on the web. I will try to figure out a way to add these.
Lastly, when I run into broken links but I can find the text listed as an example in the Duolingo Vietnamese-English dictionary, I am linking to that.
Changelog 03-10-2021
Added links for: Jobs 2 Modals Miscellaneous Science Medical Country2 Verbs4 Questions1 Communications Arts Jobs Objects2 Politics Phrases3 Places Verbs 2.5
The more I use the mobile version, the more sentences I run into that I didn't see regularly on the web version. Sometimes I can't find them on the web, and I'm making a list of those which I hope to incorporate at some future date (usually, they are just the 'reverse' of what Vietnamese-->English or English-->Vietnamese that I already had included on the web).
Changelog 03-16-2021
Added items to Geography, Adjectives 1.5, Abstract Objects 1, Conjunctions, Politics, Medical, Numbers, Country 1, Abstract Objects 2, and Alphabet 1.
Changelog 03-24-2021
Added Links to: People, Nature, Jobs 2, Adverbs, Verbs 4, Prepositions 1, Future, Animals 2, and Miscellaneous. I continue to get new material on passes using the mobile version, or reverse translations, that I never encountered in many passes using the web version.
Changelog 04-08-2021
Added items to: Time, Country 2, Places, Abstract Objects 1, Adjectives 2, Determinative, Travel, Verbs 3, and Medical. I'm still struggling with a way to include exercises that don't have findable links and/or the reverse translations of what I have.
Changelog 04-19-2021
Added items to Phrases 2, Attributes, Prepositions 1, Objects 2, Family, Nominalize, Phrases 3, and Adjectives 2.
Changelog 04-27-2021
Started a new module, Economics. Added links to Travel, Verbs 4, Past, Animals 2, Medical, Places, Miscellaneous, and Politics.
Changelog 05-05-2021 (Happy Cinco de Mayo!)
Added hyperlinks to Economics, Past, Modals, Verbs 2, Communications, Country 2, and Jobs.
Eventually, even though I won't have the hyperlinks, I'll add exercises, that I see where the discussion pages don't load to give at least one correct English <--> Vietnamese translation for that exercise.
Changelog 05-11-2021
Added links to Places, Time, Phrases 3, Abstract Objects 1, Verbs 4, and Economics.
Changelog 05-20-2021
Added links to Economics, Country 1, Verbs 2.5, Future, Politics, and Jobs 2.
Changelog 05-28-2021
Added links to Economics, Conjunctions, Nature, Abstract Objects 1, Miscellaneous, Abstract Objects 2, Attributes, Animals 2, Frequency, and Places. I will also upload a document having the exercises I will not have links to now soon.
Changelog 10-17-2021
Sorry for the long absence, my computer died, and I had to buy a new one. However, I kept this project going.
Added hyperlinks to Communications, Verbs 4, Adjectives 2, Abstract Objects 1, Abstract Objects 2, Adjectives 1.5, Objects 2, Adverbs, Politics, Verbs 2.5, Jobs 2, Economics, Adjectives 1, Conjunctions, Verbs 2, Medical, and People.
Changelog 10-24-2021
Added links to Astronomy. Added a link to Adjectives 1.
Changelog 11-02-2021
Added links to Astronomy
Changelog 12-13-2021
Added links to Economics, Classifiers 2, Country 2, and Communications.
Changelog 01-08-2022
Added links to Geography, Nominalize, Phrases 3, Attributes, Animals 2, Nature, Alphabet 2, Economics, Classifiers 2, Time, Objects 2, Abstract Objects 1, Verbs 2, Adverbs, Travel, People, Phrases 2, Country 1, and Places. Updated broken links document as well.
Changelog 01-30-2022
Added two new modules, Adjectives 3 and Verbs 5.
Added links to Verbs 2.5, Conjunctions 2, Determinative, Adjectives 1, Modals, Education, Communications, Objects 2, Verbs 4, Abstract Objects 2, Verbs 2, Numbers, Time, and Adjectives 1.5. Updated more broken links as well.
Changelog 02-08-2022
Added links to Time, Adjectives 3, Alphabet 2, Country 2, Travel, Places, Phrases, Medical, Verbs 5, Future, Nature, Phrases 3, Science, Comparison, Verbs 3, Adjectives 2, Ordinate Numbers, and Numbers.
Changelog 02-14-2022 (Valentine's Day!)
Added links to Numbers, Ordinate Numbers, Time, Jobs, People, Politics, Verbs 2, and Family.
Changelog 2-21-2022
Added links to Comparison, Relative Clause, Verbs 5, Nominalize, Miscellaneous, Past, Animals 2, Attributes, Adjectives 3, Geography, Family, and Time.
Changelog 02-28-2022
Added links to Verbs 5, Adjectives 3, Verbs 2.5, Alphabet 1, Basics 2, Objects 2, Verbs 2, Alphabet 2, Country 2, Economics, Prepositions 1, Places, and Time.
Changelog 03-07-2022
Added links to Education, Nature, Phrases 2, Conjunctions 2, Abstract Objects 1, Jobs 2, Prepositions 1, Comparison, and Verbs 2.
Changelog 03-13-2022
Began a new module, "Vietnam". Added links to Politics, Abstract Objects 2, Country 1, Travel, Adjectives 3, People, and Adjectives 2.