Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
doanh than » doanh thanh, doanh nhan, doanh phan
cua truong » cua trung, xuan truong, cac truong
hieu lang » hieu quang, nhieu tang, hieu van
than cua » nhan cua, thai cua, ban cua
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap

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) or (hieu lang)) - doanh than cua truong ((cong dan) OR (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - doanh than cua truong ((cong dan) OR (cong san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu lang)) - doanh than cua truong ((cong dan) OR (cong san)) than cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - doanh than cua truong ((cong dan) OR (cong san)) than cau*.