Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, mot chieu
trong tan » trong quan, trong ca, cong tan
ho chieu » theo chieu, hoc thieu, mot chieu
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 (ho 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 (ho chieu)) tinh - canh trinh va dung ((trong tan) OR (trong cac)) than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (ho chieu)) tinh - canh trinh va dung ((trong tan) OR (trong cac)) than cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) tinh - canh trinh va dung ((trong tan) OR (trong cac)) than cao*.