Our bill always includes the base tips: the madam and waiter tip of 1,500,000₫ per room, and 1,000,000₫ per hostess for three hours. They are charged automatically when you settle up, so there is nothing to hand over separately.
What happens is this: the games go well, someone looks after the table nicely, and a guest hands over some cash in the room to say thanks — then assumes the tipping is done. When the bill arrives with the base tips on it, it feels like being charged twice.
Money you hand over in the room is an extra tip. It does not count towards the base tip, which stays on the bill. For two guests and two hostesses, for example, the base tips on the bill come to 3,500,000₫. Anything you give in the room sits on top of that.
If in doubt, ask the manager before you hand anything over: "Is this separate from the base tip?"