Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
cong quang » luong quang, thong quang, duong quang
dung cong » dung trong
quang tan » quang tuan, quang tran, quang toan
cong ha » cong hoa, dong ha, cong tac
ha dung » hai dung, kha dung, nha dung
tan cao » toan cao, tao cao, tay cao

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 (chinh sach)) - thanh cong ha dung cong quang tan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chinh sach)) - thanh cong ha dung cong quang tan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chinh sach)) - thanh cong ha dung cong quang tan cao*.