Perhaps you should try some spelling variations:
truong cong » truong dong, truong long, truong chung
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
khang chan » khang chien, quang chan
trung cua » truong cua, trung tuan, trung cap
than cap » khan cap, thanh lap, thanh cac

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 - thanh trung cua ((truong cong) OR (trong cong)) tac ((than cap) or (khang chan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trung cua ((truong cong) OR (trong cong)) tac ((than cap) OR (khang chan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh trung cua ((truong cong) OR (trong cong)) tac ((than cap) or (khang chan))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trung cua ((truong cong) OR (trong cong)) tac ((than cap) or (khang chan))*.