Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
anh dong » anh huong, anh son
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
dong va » dung va, dong ha, luong va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (nhieu tang)) - anh dong va ((hang cong) OR (bang cong)) tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (nhieu tang)) - anh dong va ((hang cong) OR (bang cong)) tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (nhieu tang)) - anh dong va ((hang cong) OR (bang cong)) tac toan cau*.