Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dung cong » dung trong
cot lieu » vat lieu, so lieu, cu lieu
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
co lieu » co hieu, so lieu, cu lieu
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((co lieu) or (cot lieu)) tinh - canh trinh va dung cong ((dan toan) or (anh tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co lieu) OR (cot lieu)) tinh - canh trinh va dung cong ((dan toan) OR (anh tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: ((co lieu) or (cot lieu)) tinh - canh trinh va dung cong ((dan toan) or (anh tuan)) cau*.