Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
canh tran » canh tranh, hanh trang, banh trang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
tran van » luan van
van dung » van dong, xay dung, tin dung
tac toan » tap toan, tam toan, hach toan
tam than » ban than

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) xanh - canh tran van dung cong ((tac toan) or (tam than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - canh tran van dung cong ((tac toan) OR (tam than)) ban.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - canh tran van dung cong ((tac toan) or (tam than)) ban*.