Trung Tam Giao Duc Ky Thuat Tong Hop So 4 Ha Noi Address: No 9 Hai Ba Trung, Hoan Kiem District, Ha Noi City Enterprise code: 0100129085 Phone: 0248255237 Representative: Ngo Dinh Hai Adress: Nha 307, K12 Bach Khoa, Hai Ba Trung District, Ha Noi City Hoan Kiem District, Ha Noi CityFounding date: 30 - 5 - 1998