Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
trong dan » trong dang, trong san, trong tan
ho chieu » theo chieu, hoc thieu, mot chieu
va duong » van duong, va tuong, va huong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
va dung » van dung, vat dung, va ung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) tinh - canh tranh ((va dung) OR (va duong)) trong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (ho chieu)) tinh - canh tranh ((va dung) OR (va duong)) trong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) tinh - canh tranh ((va dung) OR (va duong)) trong dan toan cao*.