Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
tranh van » tran van, trinh van, thanh van
hang cong » dang cong, hang nong, bang cong
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau
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 ((nhung cong) or (hang cong)) dan ((phan cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh van ((nhung cong) OR (hang cong)) dan ((phan cau) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh van ((nhung cong) or (hang cong)) dan ((phan cau) or (phan dau))*.