4+1 LTD Address: No 4, Lane 86, De Tran Khat Chan Street, Vinh Tuy Ward, Hai Ba Trung District, Ha Noi City Enterprise code: 0111421564 Phone: 0383883339 Representative: Truong Ngoc Son Vinh Tuy Ward, Hai Ba Trung District, Ha Noi CityFounding date: 19 - 3 - 2026