Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
thanh cung » thanh cuong, thanh cong, thanh tung
hang cong » dang cong, hang nong, bang cong
cung cap » trung cap
cap hang » cap hoang, cap bang, cap han
cong tan » cong tac, cong san, cong thanh

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 (hieu quang)) - thanh cung cap hang cong tan ((toan ban) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu quang)) - thanh cung cap hang cong tan ((toan ban) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu quang)) - thanh cung cap hang cong tan ((toan ban) or (van ban))*.