Perhaps you should try some spelling variations:
race championships » a championship, _ championships, rally championship
african regional » africa regional, african region, africa region
regional role » regional route, regional rules, region role
reader race » gender race, reader preface, reader rapter
reader base » reader based, leader based, broader base
role race » rule race, noble race, whole race

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: (( african regional ((reader race) OR (reader base)) championships ) OR ( african regional role race championships )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( african regional ((reader race) OR (reader base)) championships ) or ( african regional role race championships ))".
• Adding a wildcard symbol may retrieve word variants: (( african regional ((reader race) OR (reader base)) championships ) or ( african regional role race championships ))*.