Tam Tam Brunch and Dinner. 6767 Wilson Blvd., Falls Church. Eden Center in Falls Church, the region’s hub for Vietnamese food, is overwhelmingly made up of casual mom-and-pop eateries. Restaurateur couple Thao Tran and Tin Truong want to add a slightly more upscale date-night spot to the mix. Their new restaurant, Tam Tam Brunch and Dinner, has a trendy bistro vibe, with a menu spanning from a citrusy salmon crudo to abalone soup to a variety of…