Perhaps you should try some spelling variations:
"mexican national radio _ championships" » "american national radio _ championships", "mexico's national radio _ championships", "mexican international radio _ championships"
"african national radio _ championships" » "american national radio _ championships", "african regional radio _ championships", "african traditional radio _ championships"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mexican national radio _ championships\") OR (\"african national radio _ championships\"))".
• Removing quotes may allow a broader search: (( mexican national radio _ championships ) OR ( african national radio _ championships )).
• Adding a wildcard symbol may retrieve word variants: (("mexican national radio _ championships") OR ("african national radio _ championships"))*.