My wife and son and I are going to Vietnam Feb 5th and I'm giving her a crash course on Vietnamese right now.
If you don't find anything structured soon enough, I can give you a few noon hour courses on basic phrases. My wife borrowed a book from the library, those Lonely Planet type books that have survival phrases in the back and I could just teach you those with the correct pronunciation. If I prove to be helpful to you, you can pay me with a $4.75 Chicken Teriyaki at Robson Public Market lol.