Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
chiet tach » chieu sach
tang duong » tang cuong, tuong duong, giang duong
hieu lang » chieu sang, hieu quang, nhieu tang
tang dong » lang dong, nang dong, wang dong
cong tan » cong tac, cong san, cong thanh
tan doan » tran doan, tap doan, van doan
doan cao » doanh cao, toan cao, doan cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chiet tach) or (hieu lang)) - hanh ((tang duong) OR (tang dong)) truong cong tan doan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu lang)) - hanh ((tang duong) OR (tang dong)) truong cong tan doan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu lang)) - hanh ((tang duong) OR (tang dong)) truong cong tan doan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu lang)) - hanh ((tang duong) OR (tang dong)) truong cong tan doan cao*.