Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
nho hieu » nha hieu, nho sieu, nhu hieu
tranh va » tranh van, trang va, trinh va
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu lang - hanh tranh va ((nhung cong) OR (hang cong)) ((xuan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - hanh tranh va ((nhung cong) OR (hang cong)) ((xuan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho hieu lang - hanh tranh va ((nhung cong) OR (hang cong)) ((xuan toan) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh tranh va ((nhung cong) OR (hang cong)) ((xuan toan) or (dan than)) cau*.