Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
trinh quan » tinh quang, trinh luat, trinh han
trinh qua » trinh cua, trinh quang, trinh luat
dung cong » dung trong
chu sang » chu bang, thu sang, chuc nang
cong san » cong tac
san than » sang than, san thanh, ban than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu sang) or (chieu sang)) - canh ((trinh qua) OR (trinh quan)) dung cong san than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sang) OR (chieu sang)) - canh ((trinh qua) OR (trinh quan)) dung cong san than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sang) or (chieu sang)) - canh ((trinh qua) OR (trinh quan)) dung cong san than cap".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sang) or (chieu sang)) - canh ((trinh qua) OR (trinh quan)) dung cong san than cap*.