Perhaps you should try some spelling variations:
luong quang » luong quan
chieu sach » chinh sach, chiet tach, chieu sang
dung quang » dang quang, dung quan, dung luan
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
thanh cau » thanh chau, thanh mau, nhanh cau
thanh chu » thanh chau, thanh cha, thanh thu
cong tac » cong ty

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 ((dung quang) OR (luong quang)) dung cong tac ((thanh cau) or (thanh chu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((dung quang) OR (luong quang)) dung cong tac ((thanh cau) OR (thanh chu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((dung quang) OR (luong quang)) dung cong tac ((thanh cau) or (thanh chu))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((dung quang) OR (luong quang)) dung cong tac ((thanh cau) or (thanh chu))*.