Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
nong tac » cong tac, nong tan, tuong tac
dong tac » cong tac, dong tai, dong bac
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap
tam han » tam than, tam chan, tam hon

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 - thanh trung tam han ((nong tac) or (dong tac)) ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung tam han ((nong tac) OR (dong tac)) ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung tam han ((nong tac) or (dong tac)) ((than cau) or (toan cau))*.