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
trung cua » truong cua, trung tuan, trung cap
nong dan » nong san, nguong dan, huong dan
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - thanh trung cua cong ((nong dan) or (cong dan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh trung cua cong ((nong dan) OR (cong dan)) phan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh trung cua cong ((nong dan) or (cong dan)) phan cau*.