Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
quang trung » truong trung
thieu sang » chieu sang, thieu khang, thieu quang
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
cong san » cong tac
chan cau » phan cau, can cau, chinh cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - canh trinh quang trung ((cong dong) or (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh trinh quang trung ((cong dong) OR (cong san)) chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh trinh quang trung ((cong dong) or (cong san)) chan cau*.