Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh luan » khanh luan, hang luan, hanh luat
van nhung » van nhuong, va nhung, van hung
manh toan » thanh toan, anh tuan, tinh toan
van thanh » ban thanh, van tuan
dan than » dan chan, ban than, van than

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh luan van nhung cong ((manh toan) OR (((dan than) OR (van thanh)))) cau~.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh luan van nhung cong ((manh toan) or (((dan than) or (van thanh)))) cau*.