I think you two are speaking of the same person. Tran Manh Tuan got a scholarship from Berkeley and studied with some great players there. He came back to Vietnam, opened a club called Sax 'n Art... His CDs are NOWHERE NEAR compare to his "real" playing. His skills and techniques are amazing. He have to made those "cheesy" CD to survive! If you have the chance, visit his club in the 1st District, Hochiminh City in Vietnam, you'll be amazed.
I came back to Vietnam couple years ago jammed with him at his club, spoke with him for couple hours and learned a great deal about him. He said that if he made the CDs the way he would, he won't be able to sell nearly as much, so the only way for him to be able to play what he's really like, he has to sell the CDs that he don't really like!!!
Another Vietnamese sax player here in the US is Hoai Phuong, currently playing for large entertainment companies such as Thuy Nga Paris, Asia, Van Son, etc... He IS GOOD! He studied from Snow University in Utah, got his master in Saxophone performing at Brigham Univeristy and performed with many great bands. After graduated, he was invited back to Snow university and tought many classes there. He is one of my favorites sax player, and certainly one of the best Vietnamese saxophonists.