Ban Quan Ly Du An Dau Tu Va Xay Dung Huyen Phu Yen Address: Khoi 5, Phu Yen Town, Phu Yen District, Son La Province Enterprise code: 5500357261 Phone: 02123863515 Phu Yen Town, Phu Yen District, Son La ProvinceFounding date: 30 - 3 - 2009