Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
manh toan » thanh toan, anh tuan, tinh toan
hoc tien » hoc tieng, hoc hien, hoc vien
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, xuan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tien thinh - canh trinh va nhung cong ((dan toan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien thinh - canh trinh va nhung cong ((dan toan) OR (manh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc tien thinh - canh trinh va nhung cong ((dan toan) or (manh toan)) cau*.