Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
chieu sang » chieu sach, chieu xanh, hieu lang
luan phung » luan phuong, luan chung, luan phong
phung cong » nhung cong, phong cong, nhung chong
hieu van » hieu va, thien van, lieu va
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 van)) - thanh dung luan phung cong tac dan ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu sang) OR (hieu van)) - thanh dung luan phung cong tac dan ca".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) OR (hieu van)) - thanh dung luan phung cong tac dan ca*.