Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong cong » phuong dong, phong cong, phung cong
hieu nganh » vien nganh, hiem ngan, hieu manh
cao phuong » cac phuong, cau phuong, cao phong
trung cao » truong cao, trung cap, trung co
khoan cam » khoa cam, phan cam, thuan cam
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, thanh cac
khoan va » doan va, khoa ma, nhan va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - thanh trung cao phuong cong tan ((than cap) OR (((khoan cam) OR (khoan va))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - thanh trung cao phuong cong tan ((than cap) or (((khoan cam) OR (khoan va))))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - thanh trung cao phuong cong tan ((than cap) or (((khoan cam) OR (khoan va))))*.