Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
trung quan » truong quan, trong quan, trung tuan
quan trong » gian trong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cac » thanh cac, phan cac, thac cac

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) or (chieu sang)) - thanh trung quan trong cong ban than cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - thanh trung quan trong cong ban than cac.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - thanh trung quan trong cong ban than cac*.