Dau Tu Phat Trien Vien Thong TC Joint Stock Company Address: No 4, Lot 2C, Trung Yen Urban Area, Cau Giay District, Ha Noi City Enterprise code: 0104121778 Phone: 02437713789 Representative: Nguyen Ha Dung Adress: No 4, Lot 2C, Trung Yen Urban Area, Cau Giay District, Ha Noi City Cau Giay District, Ha Noi CityFounding date: 20 - 8 - 2009