In Hanoi, it seems most are Viet girls. At Neko Nuru Massage, you choose a package price as per the website. The girl will ask for extras, I was offered a few choices at around 200,000 to 400,000 dong each. Apparently this shop has no expectation for tips to either the girl or the concierge.
In the Japanese entertainment district in HCM, supposedly girls from Korea and Cambodia, I was told. These are asking Japanese-businessman prices, on a card that is stuck under your nose as you walk past the supermarket, with whispers of more if you hesitate in your stride