Perhaps you should try some spelling variations:
thanh trung » thanh tung
khong thong » thong thong, khong trong, thong thuong
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
doan phan » doanh phan, toan phan, doanh nhan
dan phan » dan chan, van phan, dam phan

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: doi ((hieu lang) OR (nhieu tang)) - thanh trung cua khong thong ((dan phan) OR (doan phan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (nhieu tang)) - thanh trung cua khong thong ((dan phan) OR (doan phan)) cau~".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (nhieu tang)) - thanh trung cua khong thong ((dan phan) OR (doan phan)) cau*.