Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san van » tan van, luan van, tran van
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((trieu tinh) or (((nhieu tang) or (hieu lang)))) - canh tranh va nhung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((trieu tinh) OR (((nhieu tang) OR (hieu lang)))) - canh tranh va nhung cong san van ban.
• Adding a wildcard symbol may retrieve word variants: ho ((trieu tinh) or (((nhieu tang) or (hieu lang)))) - canh tranh va nhung cong san van ban*.