Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
bang cong » dang cong, bang song, hang cong
van thanh » ban thanh, van tuan
trang va » tran van, hang va
dan toan » van toan, dan than, manh toan
va bang » va nang, va lang, va ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (hieu qua)) - hanh trang va bang cong ((dan toan) or (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu qua)) - hanh trang va bang cong ((dan toan) OR (van thanh)) cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu qua)) - hanh trang va bang cong ((dan toan) or (van thanh)) cao*.