Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chan ban » can ban, chat ban, chan nan

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

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