In an inddor exhibit signed "silver cheek". The zoo used to hold Chinese Ferret Badgers in early 2010s, but I don't know if these are the same species.
This is most likely a Burmese ferret-badger. This species is dominant in southern Vietnam, though its distribution overlaps with that of the Chinese ferret-badger in some parts of Vietnam. The catch, however, is that while these two species are easily distinguishable by their skulls and teeth, distinguishing live individuals is far more challenging—ferret-badgers exhibit significant variability in their fur coloration.
@YuanChang
Thanks! Yes it does resemble colorings of the animal I saw at Saigon Zoo and Botanical Gardens, but it looked a bit different. The variables in fur coloration makes sense!