Khoang Xanh - Tan Vien Son LTD Address: No 44, Phung Hung Street, Hang Bong Ward, Hoan Kiem District, Ha Noi City Enterprise code: 0101326696 Phone: 0248289837 Representative: Mai Xuan Trinh Adress: 44 Phung Hung, Hoan Kiem District, Ha Noi City Hang Bong Ward, Hoan Kiem District, Ha Noi CityFounding date: 24 - 1 - 2003