Since part of the setting is Vietnam, it is natural for the characters to speak Vietnamese. If you notice all the signs and posters in the movie while they were in Vietnam, you will see that they are not in Vietnamese at all, but probably Chinese.
Also, when Bond is with Wai Lin in her high-tech hideout, he says he'll use the computer, which has Oriental letters on the keys. Bond turns down this opportunity, like he doesn't know the language. In 1967's "You Only Live Twice", Bond says he took a First in Oriental Languages at Cambridge.
Vietnam had adopted Latin letters after using Chinese characters for centuries. Most signs and posters in streets and on vehicles are in Chinese. No Chinese language can be found in today’s Vietnam because all Chinese had been wiped out after the fall of Saigon. Actually the all Vietnam scenes were shot in Thailand, in which has huge Chinese population. During the scene of James Bond and Wai Lin seeking a boat, you can see some words on side of a truck written in Thai.
![[Slipups.com Logo]](/images/slipupslogo_small.gif)
