Forgot to add how approachable many of the Vietnamese girls are. Many of the online forums do talk about how they can be hard to crack. After a week or so here I found my perfect opening line for the pretty lady sitting nearby in the coffee shop. "HI, do you know the wifi password?" That was usually enough to start a conversation. No need to overthink. Yes I got declines from further conversations but not before having enough success to add it to my repertoire.