Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, doi chi, ho chieu
canh tinh » hanh tinh, manh tinh, canh tranh
trong dan » trong dang, trong san, trong ban
trong tan » trong quan, trong cac, trong ca
toan cao » toan ban, toan tap
tinh va » tich va, trinh van, trinh vat
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 tinh va dung ((trong dan) or (trong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo chieu)) tinh - canh tinh va dung ((trong dan) OR (trong tan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo chieu)) tinh - canh tinh va dung ((trong dan) or (trong tan)) toan cao*.