Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
luan nang » luan van, van nang, luan san
cuong tap » luong tap, cong tac, luong tai
anh dung » anh dong, anh huong, sach dung
cong tap » cong tac, cong tan, tong tap
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 ((nhieu tang) or (hieu lang)) - anh dung luan nang ((cong tap) or (cuong tap)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((nhieu tang) OR (hieu lang)) - anh dung luan nang ((cong tap) OR (cuong tap)) toan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((nhieu tang) or (hieu lang)) - anh dung luan nang ((cong tap) or (cuong tap)) toan tap*.