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 tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
tran van » luan van
dan than » van than, dan toan, dang thanh
ban than » ban thanh, van thanh, ban hang
dan chan » dan gian, dan ca, van chat

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 tran van nhung cong ((((dan than) OR (ban than))) OR (dan chan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh tran van nhung cong ((((dan than) OR (ban than))) or (dan chan)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh tran van nhung cong ((((dan than) OR (ban than))) or (dan chan)) cau*.