Perhaps you should try some spelling variations:
thanh quang » nhanh quang, thanh quan, than quang
chieu sang » chieu sach, chieu xanh, hieu lang
canh thanh » canh tranh, danh thanh, anh thanh
doi chieu » doc hieu, doi chi, ho chieu
doan phan » doanh phan, toan phan, doanh nhan
dan phan » dan chan, van phan, dam phan

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