Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
phung cong » nhung cong, phong cong, nhung chong
hieu lang » hieu quang, nhieu tang, hieu van
cap phung » chap phong, tap phuong, cac chung
cong cap » cung cap, cong cau, cong cac
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 cong cap phung cong tac dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu lang)) - thanh cong cap phung cong tac dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (hieu lang)) - thanh cong cap phung cong tac dan ca*.