I thought I was clear, perhaps not. I was saying that the SkyTeam Lounge Finder shows only the Vietnam Airlines in the Hanoi Domestic Terminal and does not isay about the Vietnam Airlines Lotus Lounge in the Hanoi International Terminal, so the information is incomplete. Furthermore, the same webpage says the Vietnam Airlines Domestic Lounge is used by Air France and China Eastern also - very strange.

However, I have found the information I need and China Airlines uses the ACV Business Lounge in the Hanoi International Terminal.