Just found a great video on Flash Cards (Study Cards). What they are and how to use them. I strongly recommend to use Flash Cards for your vocabulary studies. Thanks to Kevin Patton from http://www.youtube.com/user/kevintpatton

Here is a great link that shows you how to set up the Vietnamese type set on your iPhone4. Might also work for other iPhone versions, iPod and iPad.

How to Type Vietnamese on iPhone 4