Perhaps you should try some spelling variations:
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
anh dung » anh dong, anh huong, sach dung
luan ban » luan van, luan san, luan han
ban cong » bang cong, van cong, phan cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) or (hieu lang)) - anh dung luan ban cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - anh dung luan ban cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu lang)) - anh dung luan ban cong tac toan tap*.