Truong Mam Non Dong Yen Address: Dong Yen, Dong Son District, Thanh Hoa Province Enterprise code: 2801407880 Phone: 02378784417 Adress: Dong Son District, Thanh Hoa Province Dong Yen Commune, Dong Son District, Thanh Hoa ProvinceFounding date: 6 - 7 - 2009