I always like using Anki (free flashcard software) to learn new vocabulary. I have my own flashcard deck on Anki which I add to after every Vietnamese class, however you can find pre-built decks if you search for something like "Vietnamese Anki deck". Here's one I found: https://www.reddit.com/r/learnvietnamese/comments/1xiz00/basic_vietnamese_a_release_candidate_1_anki_deck/ I am still very much a beginner, but I have found that studying the Vietnamese vocabulary I have learned through Anki has made it much easier to learn, retain and use. Hope this helps!

I can teach you Vietnamese

i can :D

Tôi rất vui nếu được giúp đỡ bạn để học thành thạo ngôn ngữ Tiếng Vệt của chúng tôi

i can help you.