Truong Pho Thong Co So, Xa Viet Yen, Huyen Van Quan , Lang Son Address: Khon Bo, Viet Yen, Van Quan, Lang Son, Van Quan District, Lang Son Province Enterprise code: 4900416110 Phone: 02053731888 Adress: Van Quan District, Lang Son Province Van Quan Town, Van Quan District, Lang Son ProvinceFounding date: 29 - 10 - 2009