Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, ho chieu
mot chieu » ho chieu
trong tan » trong quan, trong ca, cong tan
trinh va » trinh van, trinh vat, trinh ve
than cao » toan cao, thai cao, than cap
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 (mot chieu)) tinh - canh trinh va dung ((trong tan) or (trong cac)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (mot chieu)) tinh - canh trinh va dung ((trong tan) OR (trong cac)) than cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (mot chieu)) tinh - canh trinh va dung ((trong tan) or (trong cac)) than cao*.