Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
trinh san » trinh han, trinh quan, trinh toan
san dau » van dau, san diu, ban dau

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)) - hanh tinh chat ((hang cong) OR (dang cong)) trinh san dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (nhieu tang)) - hanh tinh chat ((hang cong) OR (dang cong)) trinh san dau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (nhieu tang)) - hanh tinh chat ((hang cong) OR (dang cong)) trinh san dau*.