- I think the best place to start is Easy Vietnamese that comes with audio from this page.
- You can also buy Elementary Vietnamese as a supplement to, or replacement for, Easy Vietnamese. There is audio here.
- After you reach an intermediate level, you can consider Continuing Vietnamese, with audio here.
- There’s a reader called “Vietnamese Stories for Language Learners” with audio here. There is a second book, possibly a second edition, out in 2022.
- Colloquial Vietnamese: The Complete Course for Beginners is normally where I would start, but the link to the page for their audio files doesn’t seem to be working.