Vien Thong Dai An Joint Stock Company Address: Zoom 204, No 34, Lane 42, Yen Hoa Street, Yen Hoa Ward, Cau Giay District, Ha Noi City Enterprise code: 0103913227 Phone: 02422158214 Representative: Nguyen Van Chinh Adress: No 430, Khuong Dinh Street, Ha Dinh Ward, Thanh Xuan District, Ha Noi City Yen Hoa Ward, Cau Giay District, Ha Noi CityFounding date: 3 - 6 - 2009