Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhieu tang » chieu sang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, hieu van
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong san » cong tac
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang 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: theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong san ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong san ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong san ((phan cau) or (phan dau))*.