Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
bien tinh » bi tinh, yen tinh, diep tinh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan
so bien » mot bien

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

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