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
canh manh » lanh manh, canh tranh, cach mang
cong san » cong tac
manh va » hanh va, anh va, minh va
san van » tan van, luan van, tran van

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

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