Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
trung ap » trung cap, trung lap, trung tam
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan ban » van ban
ap dung » xay dung, van dung

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

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