Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
dong cong » duong cong, dung cong, dang cong
cua tinh » cua sinh, va tinh, ha tinh
san dong » van dong, dan dong, can dong
dan toan » van toan, manh toan, dien toan
dan than » dan chan, ban than, van than
o cua » co cua, do cua, bo cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: o cua tinh - canh thanh san dong cong ((((dan toan) or (xuan toan))) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: o cua tinh - canh thanh san dong cong ((((dan toan) OR (xuan toan))) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: o cua tinh - canh thanh san dong cong ((((dan toan) or (xuan toan))) or (dan than)) cao*.