Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
yen tinh » tuyen tinh
vat dung » van dung, va dung, viet dung
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
ho yen » o yen, chao yen, hong yen

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

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