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
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
trung su » trung vu, trong su, trung du
van toan » van tuan, van tan, van thanh

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 (nhiet nang)) - thanh trung su dung cong ((manh toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (nhiet nang)) - thanh trung su dung cong ((manh toan) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (nhiet nang)) - thanh trung su dung cong ((manh toan) or (van toan)) cau*.