Perhaps you should try some spelling variations:
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, doi chieu
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
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: ((doc hieu) or (ho chieu)) tinh - canh tranh va dung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (ho chieu)) tinh - canh tranh va dung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ho chieu)) tinh - canh tranh va dung cong san toan cao*.