Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
dung thanh » duong thanh, dong thanh, dang thanh
hieu lang » hieu quang, nhieu tang, hieu van
luan cong » luat cong, luong cong, luan chung
cong cong » cong dong, trong cong, dung cong
dung toan » dung doanh, dung thang, dung tai
anh dung » anh dong, anh huong, sach dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) OR (hieu lang)) - anh dung luan cong cong ((dung toan) or (dung thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - anh dung luan cong cong ((dung toan) OR (dung thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (hieu lang)) - anh dung luan cong cong ((dung toan) or (dung thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (hieu lang)) - anh dung luan cong cong ((dung toan) or (dung thanh)) cau*.