Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
lieu tinh » trieu tinh, diep tinh
bien tinh » bi tinh, yen tinh, diep tinh
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((lieu tinh) or (bien tinh)) - canh trinh va dung cong ((dan toan) OR (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((lieu tinh) OR (bien tinh)) - canh trinh va dung cong ((dan toan) OR (dan than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((lieu tinh) or (bien tinh)) - canh trinh va dung cong ((dan toan) OR (dan than)) cao".
• Adding a wildcard symbol may retrieve word variants: ho ((lieu tinh) or (bien tinh)) - canh trinh va dung cong ((dan toan) OR (dan than)) cao*.