Operation Smile Address: 4th Floor, 16 Ngo Quyen Building, Trang Tien Ward, Hoan Kiem District, Ha Noi City Enterprise code: 0102025959 Phone: 0249365426 Representative: Nguyen Viet Phuong Adress: Civil Group 20, Nghia Do Ward, Cau Giay District, Ha Noi City Trang Tien Ward, Hoan Kiem District, Ha Noi CityFounding date: 13 - 9 - 2006