Perhaps you should try some spelling variations:
chiet tach » chieu sach
tung thanh » trung thanh, tang thanh, dung thanh
thanh hang » thanh hoang, thanh thang, tranh hang
hieu quan » hieu qua, lieu quan, thien quan
manh tung » manh hung, thanh tung
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: ho ((chiet tach) or (hieu quan)) - manh tung thanh hang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu quan)) - manh tung thanh hang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu quan)) - manh tung thanh hang cong dan toan cao*.