Perhaps you should try some spelling variations:
canh doanh » hanh doanh, chinh doanh, doanh doanh
nhieu tang » chieu sang, nhiet nang
doanh luan » doanh nhan
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, hieu van
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau

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 doanh luan ((nhung cong) or (trong cong)) tan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (nhieu tang)) - canh doanh luan ((nhung cong) OR (trong cong)) tan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (nhieu tang)) - canh doanh luan ((nhung cong) or (trong cong)) tan phan dau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (nhieu tang)) - canh doanh luan ((nhung cong) or (trong cong)) tan phan dau*.