Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh thanh » canh tranh, danh thanh, anh thanh
thanh qua » thanh quan, thanh qui, hanh qua
cong cong » trong cong, dung cong, dang cong
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) OR (chieu sang)) - canh thanh qua ((cong cong) or (cong dong)) san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - canh thanh qua ((cong cong) OR (cong dong)) san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chieu sang)) - canh thanh qua ((cong cong) or (cong dong)) san van ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chieu sang)) - canh thanh qua ((cong cong) or (cong dong)) san van ban*.