Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, ho chieu
trinh va » trinh van, trinh vat, trinh ve
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang
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: ((doi chieu) or (theo chieu)) tinh - canh trinh va dung trong ((dan than) OR (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo chieu)) tinh - canh trinh va dung trong ((dan than) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (theo chieu)) tinh - canh trinh va dung trong ((dan than) OR (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo chieu)) tinh - canh trinh va dung trong ((dan than) OR (ban than)) cao*.