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
thanh cac » hanh cac, thanh ca, tranh cac
thanh bac » nhanh bac, thanh bai, thanh san
cap dung » ap dung, cao dung, chan dung
cong ban » cong bang, cong san, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu lang) or (nhieu tang)) - thanh trung cap dung cong ban ((thanh cac) OR (thanh bac))~.
• 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 cac) OR (thanh bac)).
• 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 cac) OR (thanh bac))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (nhieu tang)) - thanh trung cap dung cong ban ((thanh cac) OR (thanh bac))*.