Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
theo chau » theo chu, theo chieu, theo cap
theo phap » thi phap
dung cong » dung trong
van toanh » van thanh, van doanh, van tranh
trinh va » trinh van, trinh vat, trinh ve
van toan » van tuan, van tan, van thanh
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: ((theo chau) or (theo phap)) tinh - canh trinh va dung cong ((van toan) or (van toanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chau) OR (theo phap)) tinh - canh trinh va dung cong ((van toan) OR (van toanh)) cau.
• Adding a wildcard symbol may retrieve word variants: ((theo chau) or (theo phap)) tinh - canh trinh va dung cong ((van toan) or (van toanh)) cau*.