Tu Van Khao Sat Tung Hai LTD Address: Dinh Street, Dai Tu Town, Dai Tu District, Thai Nguyen Province Enterprise code: 4600534018 Phone: 02083824566 Representative: Nguyen Duc Hai Adress: Dinh Street, Dai Tu Town, Dai Tu District, Thai Nguyen Province Dai Tu Town, Dai Tu District, Thai Nguyen ProvinceFounding date: 1 - 4 - 2009