Perhaps you should try some spelling variations:
thanh truong » thanh thuong, thanh tung, thanh huong
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
cua trong » cua truong, cua trung, qua trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong tac » cong ty
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - ((thanh truong) OR (thanh trung)) cua trong ((huong dan) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - ((thanh truong) OR (thanh trung)) cua trong ((huong dan) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - ((thanh truong) OR (thanh trung)) cua trong ((huong dan) or (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - ((thanh truong) OR (thanh trung)) cua trong ((huong dan) or (cong tac)) toan cao*.