Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
canh trinh » canh tranh, hanh trinh, canh tinh
lieu tinh » trieu tinh, diep tinh, bien tinh
trinh va » trinh van, trinh vat, trinh ve
va duong » van duong, va tuong, va huong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
co lieu » cot lieu, co hieu, so lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co lieu tinh - canh trinh va duong cong ((dan toan) OR (dan than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co lieu tinh - canh trinh va duong cong ((dan toan) OR (dan than)) cao".
• Adding a wildcard symbol may retrieve word variants: co lieu tinh - canh trinh va duong cong ((dan toan) OR (dan than)) cao*.