I know this is a few months after your initial post, but I have several Vietnamese students and our high school has a sizable Vietnamese student body. Our herpetology club is currently working with Mauremys annamensis, endemic to Vietnam. If you still need help, let me know, as I would not expect any problems working this issue for you..

Mike Monlezun
Sandalwood High School
Jacksonville, Florida
Sandalwood Herpetology Club