Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
tuan cao » toan cao, quang cao, thuan cam
juan cao » quang cao, toan cao, quan cau

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 quan)) - thanh trung cua dung cong tac ((tuan cao) OR (juan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu quan)) - thanh trung cua dung cong tac ((tuan cao) OR (juan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu quan)) - thanh trung cua dung cong tac ((tuan cao) OR (juan cao))".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu quan)) - thanh trung cua dung cong tac ((tuan cao) OR (juan cao))*.