Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh viet » ninh viet, trinh vat
viet hanh » viet thanh, viet anh, viet han
hanh dong » anh dong, ha dong
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, xuan toan
so lieu » so dieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (so lieu)) tinh - canh trinh viet hanh dong ((dan toan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (so lieu)) tinh - canh trinh viet hanh dong ((dan toan) OR (manh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (so lieu)) tinh - canh trinh viet hanh dong ((dan toan) or (manh toan)) cau*.