Perhaps you should try some spelling variations:
tranh quang » tran quang, trinh quang, tinh quang
chieu sang » chieu sach, chieu xanh, hieu lang
quang dung » quang trung, ung dung, cuong dung
ho chieu » theo chieu, hoc thieu, doi chieu
cong san » cong tac
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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