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 cua » truong cua, trung tuan, trung cap
cua trong » cua truong, cua trung, qua trong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) OR (nhieu tang)) - thanh trung cua trong ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (nhieu tang)) - thanh trung cua trong ((cong dan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) OR (nhieu tang)) - thanh trung cua trong ((cong dan) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) OR (nhieu tang)) - thanh trung cua trong ((cong dan) or (cong san)) toan cao*.