Coming to UFC would be a nightmare.  Vietnamese fighters are about 5 3" on the average so it is very hard to find a match.  Chinese MMA fighters, on the otherhand, stand 5 8" to 6 feet and they can easily fight in UFC or in HFC (Hard Fighting Championship) Germany. MMA in Singapore head quarter has more World Champs than anywhere else.  This is just one of many MMA fighters from China with whom I am so impressed.