Thau XD Goi Thau A6 Duong Cao Toc Noi Bai-Lao Cai Cty Doosan Heavy Industries & Construction Co.,Ltd Address: Dong An Commune, Dong An Commune, Van Yen District, Yen Bai Province Enterprise code: 5200475440 Phone: 02162476110 Dong An Commune, Van Yen District, Yen Bai ProvinceFounding date: 1 - 12 - 2009