Hoan Yen Joint Stock Company Address: 169, Cai Lan Street, Ha Long City, Quang Ninh Province Enterprise code: 5700358505 Phone: 0203846387 Representative: Pham Thi Bay Adress: 169, Cai Lan Street, Ha Long City, Quang Ninh Province Ha Long City, Quang Ninh ProvinceFounding date: 24 - 7 - 2001