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
bang song » nang song
manh toan » thanh toan, anh tuan, tinh toan
cua bang » chua bang, cua ban, cua dang
van tuan » van quan, van ban, anh tuan

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 bang song ((manh toan) OR (van tuan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (nhieu tang)) - thanh trung cua bang song ((manh toan) or (van tuan)) ban~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (nhieu tang)) - thanh trung cua bang song ((manh toan) or (van tuan)) ban*.