Hi there!
We've just published a guide to useful phrases for people visiting Vietnam at:
http://www.vietnamtravel.org/learn-vietnamese
It's a bit of a first draft so we'd love some feedback about how we can improve it or whats missing that we could add. We're hoping to add some videos soon with conversations and subtitles to help people with pronunciation - is there anything else you'd suggest?
Cheers,
Jonny