Perhaps you should try some spelling variations:
a championship » _ championship
national road » national radio, national rural, national ruin
radio ad » radio _
radio a » radio _
road a » road _

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 international ((radio a) OR (radio ad)) championship ) OR ( american national road a championship )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( mexican international ((radio a) OR (radio ad)) championship ) or ( american national road a championship ))".
• Adding a wildcard symbol may retrieve word variants: (( mexican international ((radio a) OR (radio ad)) championship ) or ( american national road a championship ))*.