Perhaps you should try some spelling variations:
"mexican national radio chess championships" » "mexican national radio chess championship", "american national radio chess championships", "mexico's national radio chess championships", "mexican international radio chess championships", "mexican national radio access championships", "mexican national radio chemo championships", "mexican national radio acess championships", "mexican national radio chess championss"
"african national radio world championship" » "american national radio world championship", "african regional radio world championship", "african traditional radio world championship", "african national radio works championship", "african national radio wird championship", "african national trading world championship", "african national radio world champions"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("mexican national radio chess championships") OR ("african national radio world championship")).
• Removing quotes may allow a broader search: (( mexican national radio chess championships ) or ( african national radio world championship )).
• Adding a wildcard symbol may retrieve word variants: (("mexican national radio chess championships") or ("african national radio world championship"))*.