Perhaps you should try some spelling variations:
thanh trung » thanh tung
cuon sach » duong sach, cuoc cach, co sach
chi sach » chinh sach, chieu sach, co sach
tac dung » sach dung, xay dung, van dung
cong san » cong tac
san toan » van toan, dan toan, manh toan
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: doi ((chi sach) or (cuon sach)) - thanh trung ((tac dung) or (tin dung)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi sach) OR (cuon sach)) - thanh trung ((tac dung) OR (tin dung)) cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chi sach) or (cuon sach)) - thanh trung ((tac dung) or (tin dung)) cong san toan cau*.