Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh luan » khanh luan, hang luan, hanh luat
van nhung » van nhuong, va nhung, van hung
hoi hieu » hoi phieu, hoi tieu, moi hieu
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van tai, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh luan van nhung cong ((((van toan) OR (van tan))) or (van ban)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh luan van nhung cong ((((van toan) OR (van tan))) OR (van ban)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh luan van nhung cong ((((van toan) OR (van tan))) or (van ban)) cau".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh luan van nhung cong ((((van toan) OR (van tan))) or (van ban)) cau*.