Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh van » tran van, trinh van, thanh van
dung cong » dung trong
hang cong » dang cong, hang nong, bang cong
van thanh » ban thanh, van tuan
thanh tu » hanh tu, nhanh tu, thanh tung
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh tranh van ((dung cong) or (hang cong)) van thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh van ((dung cong) OR (hang cong)) van thanh tu.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh van ((dung cong) or (hang cong)) van thanh tu*.