Perhaps you should try some spelling variations:
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan
ho lieu » so lieu, co lieu, ho kieu
co hieu » cao hieu, doc hieu
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) or (co hieu)) tinh - canh tranh va dung cong ((tan toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho lieu) OR (co hieu)) tinh - canh tranh va dung cong ((tan toan) OR (tap toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho lieu) or (co hieu)) tinh - canh tranh va dung cong ((tan toan) OR (tap toan)) cau*".