They don'[t usually have the long legs that we associate with looking good in miniskirts, and they aren't otherwise as 'endowed' as Western women...it's something to do with the way they carry themselves...
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Somehow they pay attention to details...for some reason, although they don't take particular care when they sit down, you don't see their underwear no matter how short the skirt. Not sure how they do that!
They must watch the hang and fit very carefully. Also, if you watch closely, their top goes smoothly with the short skirt and draws attention away from their legs a little, which sort of reduces the flashiness and creates a 'cool' overall look. A lot of girls in short skirts look like they are screaming for you to notice their legs, they aren't cool at all!
I'm no style expert but the Vietnamese girls do have a way of bringing off the short skirt look wtihout appearing at all flirty really, and certainly not cheap of flashy.3