Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh dung » thanh duong, thanh tung, thanh hung
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
hieu lang » hieu quang, nhieu tang, hieu van
cong tac » cong ty
tac dan » tac danh, cac dan, tac da

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 (hieu lang)) - thanh dung luan chung cong tac dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu lang)) - thanh dung luan chung cong tac dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (hieu lang)) - thanh dung luan chung cong tac dan ca*.