Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
cong thanh » dong thanh, cong trinh, truong thanh
hanh hang » thanh hang, hang hang, hanh han
thanh ban » thanh san, thanh van, thanh bac
cong tan » cong tac, cong san, cong ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (nhieu tang)) - hanh hang va nhung ((cong tan) OR (cong thanh)) thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (nhieu tang)) - hanh hang va nhung ((cong tan) OR (cong thanh)) thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (nhieu tang)) - hanh hang va nhung ((cong tan) OR (cong thanh)) thanh ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (nhieu tang)) - hanh hang va nhung ((cong tan) OR (cong thanh)) thanh ban*.