Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trinh » canh tranh, hanh trinh, canh tinh
quan hang » quan hoang, quan hanh, qua hang
quan lang » quan hoang, gian lang, quan luan
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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 (chieu sang)) - canh trinh ((quan hang) or (quan lang)) cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - canh trinh ((quan hang) OR (quan lang)) cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - canh trinh ((quan hang) or (quan lang)) cong tan van ban*.