Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhiet nang » nhiet dong, viet nang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
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.

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