I have 2 df varieties labeled as George and Oung Ong. I can't find any information about them
That's likely George from the late George Emerich who was a prominent CRFG member. It's a white flesh variety, very sweet, but not a Vietnamese variety. I believe it is neither self fertile nor self compatible.
As for Quang Ong variety, it may be QOSF, also known as Quang Ong Self Fertile, which was later renamed as American Beauty. Magenta flesh, self fertile and self pollinating. However, he grows a lot of different varieties.
Hope this helps.