Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
manh trung » manh tung, thanh trung, manh hung
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
cua dang » cua cong, cua ban
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
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: doc ((chieu sang) or (chieu sach)) - manh trung cua dang cong tac than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu sach)) - manh trung cua dang cong tac than cao*.