Letrend Olympiad LTD Address: B1-BT5, Moi Ha Dinh Urban Area, Thanh Liet Ward, Thanh Tri District, Ha Noi City Enterprise code: 0111434997 Phone: 0975833382 Representative: Do Viet Tien Thanh Tri District, Ha Noi CityFounding date: 27 - 3 - 2026