Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trong tac » trong cac, tuong tac, trong tuc
trong tan » trong quan, trong cac, trong ca
ho chieu » theo chieu, hoc thieu, doi chieu
tam dung » tam duong, tac dung, tan dung
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: ho chieu sach - thanh trung tam dung ((trong tac) or (trong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung tam dung ((trong tac) OR (trong tan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung tam dung ((trong tac) or (trong tan)) toan cau*.