Trung Tam Quang Cao Va Dich Vu Truyen Thong Da Phuong Tien Address: 58 Quan Su, Hoan Kiem District, Ha Noi City Enterprise code: 0100108423 Phone: 0249745686; 0249745689 Adress: Quyet Tien Hamlet, Hoai Duc District, Ha Noi City Hoan Kiem District, Ha Noi CityFounding date: 23 - 10 - 1998