Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dang cong » dung cong
chi lang » thi lan, chi van, hoi lang
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
toan ban » van ban
doi chi » doi khi
va dang » van dang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi lang - canh trinh va dang cong tac ((toan cao) or (((toan tap) or (toan ban))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi lang - canh trinh va dang cong tac ((toan cao) OR (((toan tap) OR (toan ban)))).
• Adding a wildcard symbol may retrieve word variants: doi chi lang - canh trinh va dang cong tac ((toan cao) or (((toan tap) or (toan ban))))*.