Tu Van Dau Tu Va Xay Dung Khai Hoan Joint Stock Company Address: Keo Lay Hamlet, De Tham Commune, Trang Dinh District, Lang Son Province Enterprise code: 4900761678 Phone: 02378467631 Representative: Tran Khai Hoan Adress: Keo Lay Hamlet, De Tham Commune, Trang Dinh District, Lang Son Province De Tham Commune, Trang Dinh District, Lang Son ProvinceFounding date: 13 - 6 - 2013