Perhaps you should try some spelling variations:
tranh van » tran van, trinh van, thanh van
dung minh » duong minh, dung ninh, dung vinh
thiet ve » thiet ke, thiet de, thuyet ve
thieu ve » hieu ve, thiet ke, thieu so
toan cao » toan ban
toan tap » toan ban
van ung » van dung, van hung, van sung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thiet ve) OR (thieu ve)) tinh - canh tranh van ung dung minh ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thiet ve) OR (thieu ve)) tinh - canh tranh van ung dung minh ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thiet ve) OR (thieu ve)) tinh - canh tranh van ung dung minh ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((thiet ve) OR (thieu ve)) tinh - canh tranh van ung dung minh ((toan cao) or (toan tap))*.