Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
trung cap » truong cao, trung tam
dung cong » dung trong
ban thanh » ban hang
cap dung » ap dung, cao dung, chan dung
ban hanh » ban hang

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: doc ((hieu lang) OR (nhieu tang)) - thanh trung cap dung cong ((ban thanh) OR (ban hanh)) cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu lang) or (nhieu tang)) - thanh trung cap dung cong ((ban thanh) OR (ban hanh)) cac~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (nhieu tang)) - thanh trung cap dung cong ((ban thanh) OR (ban hanh)) cac*.