Optispace LTD Address: 5B, 138 Hoa Bang Lane, Yen Hoa Ward, Cau Giay District, Ha Noi City Enterprise code: 0111450371 Phone: 0966780911 Representative: Dinh Khac Doanh Yen Hoa Ward, Cau Giay District, Ha Noi CityFounding date: 7 - 4 - 2026