Dich Vu Vien Thong Thanh An Joint Stock Company Address: B4 - F4, 111 Hoang Cau Civil Group, O Cho Dua Ward, Dong Da District, Ha Noi City Enterprise code: 0102279590 Phone: 02438561358 Representative: Pham Ba Lien Adress: Van Kham Hamlet, Hien Van Commune, Tien Du District, Bac Ninh Province O Cho Dua Ward, Dong Da District, Ha Noi CityFounding date: 6 - 6 - 2007