Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
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 tap » cuong tap, cong tac, cong tan
tap quan » tac quan, hai quan
quan tap » quan tai, quan lap, quan tam

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 quang) or (hieu qua)) - anh dung luan ban cong tap quan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu quang) OR (hieu qua)) - anh dung luan ban cong tap quan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu quang) or (hieu qua)) - anh dung luan ban cong tap quan tap*.