Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dap nhung » vap nhung, dap ung, cam nhung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh trung ((dap nhung) OR (va nhung)) ((cong dan) OR (cong san)) than cau~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh trung ((dap nhung) or (va nhung)) ((cong dan) or (cong san)) than cau*.