Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
thanh tran » thanh trang, thanh toan, thanh tra
nguong dan » huong dan
tran van » luan van
van nang » van quang, van ban, van dong
nong dan » cong dan, nong san, huong dan
toan cau » 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: theo ((chieu sach) OR (chiet tach)) - thanh tran van nang ((nong dan) or (nguong dan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - thanh tran van nang ((nong dan) OR (nguong dan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chiet tach)) - thanh tran van nang ((nong dan) or (nguong dan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chiet tach)) - thanh tran van nang ((nong dan) or (nguong dan)) toan cau*.