I think all of the NYC Vietnamese restaurants I've been to are run by ethnic Chinese. Some of them are very good, but the cooking tends to be Cholon-Saigon-style. Are there any ethnic Viet places that might have different menus, or a different spin? NYC doesn't seem to have a big Viet community, though they seem to dominate the fruit & shake carts. It's probably easier to find Viet-run restaurants in Syracuse & Utica than NYC.