Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh dung » thanh dung, anh dung, hanh dong
luan dang » luan nang, luan danh, luan dong
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
than cao » toan cao, thai cao, 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: theo ((chieu sang) or (chieu sach)) - hanh dung luan dang ((cong ban) OR (cong san)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (chieu sach)) - hanh dung luan dang ((cong ban) OR (cong san)) than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (chieu sach)) - hanh dung luan dang ((cong ban) OR (cong san)) than cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (chieu sach)) - hanh dung luan dang ((cong ban) OR (cong san)) than cao*.