Tin Hoc Hoang Son LTD Address: P301 T/nha Song Hong, 4 Tran Hung Dao, Phan Chu Trinh Ward, Hoan Kiem District, Ha Noi City Enterprise code: 0103414690 Phone: 02439335001 Representative: Do Thanh Vinh Adress: Loc Ha Hamlet, Mai Lam Commune, Dong Anh District, Ha Noi City Phan Chu Trinh Ward, Hoan Kiem District, Ha Noi CityFounding date: 2 - 3 - 2009