Cong Nghe Phan Mem Va Noi Dung So 4digitalbooks LTD Address: No 23, Lane 1194, Lang Street, Lang Thuong Ward, Dong Da District, Ha Noi City Enterprise code: 0106596777 Phone: 0913546956 Representative: Dang Nguyen Tuan Tu Adress: No 3, 132 Kham Thien Lane, Kham Thien Ward, Dong Da District, Ha Noi City Lang Thuong Ward, Dong Da District, Ha Noi CityFounding date: 9 - 7 - 2014