Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
thanh luan » tranh luan, thanh xuan, thanh tuan
thong dung » thong cong, thong thuong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - thanh luan van ((nhung duong) or (thong dung)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - thanh luan van ((nhung duong) OR (thong dung)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - thanh luan van ((nhung duong) or (thong dung)) van toan cao*.