Perhaps you should try some spelling variations:
thanh trung » thanh tung
bien tinh » bi tinh, yen tinh, diep tinh
trung hoa » trung hoc, trung ha
dung cong » dung trong
hoa dung » khoa dung, hoa duong, hoa dong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
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 - thanh trung hoa dung cong ((dan toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - thanh trung hoa dung cong ((dan toan) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: so bien tinh - thanh trung hoa dung cong ((dan toan) or (dan than)) cao*.