DONG DUONG PRODUCTION JOINT STOCK COMPANY. Factory Km15 - 5A Highway - Trung Trac - Van Lam Dist., Hung Yen - Vietnam Phone: (+84).3213. 994504 Fax: (+84).3213. 994505 Office Room 688 - 26 Lang Str., Dong Da Dist., Hanoi, Vietnam Phone: (+84). 43.5642973 Fax: (+84). 43.5642973