Perhaps you should try some spelling variations:
duong cong » luong cong, duong trong, dang cong
canh trinh » canh tranh, hanh trinh, canh tinh
hieu tinh » chieu tinh, lieu tinh, kieu tinh
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
toan tap » toan ban
co hieu » cao hieu, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co hieu tinh - canh trinh va ((((duong cong) or (trong cong))) or (dung cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co hieu tinh - canh trinh va ((((duong cong) OR (trong cong))) OR (dung cong)) dan toan tap.
• Adding a wildcard symbol may retrieve word variants: co hieu tinh - canh trinh va ((((duong cong) or (trong cong))) or (dung cong)) dan toan tap*.