Perhaps you should try some spelling variations:
edward clarke » edward coke, edward cooke
evan clarke » alan clarke, jean clarke, von clarke
ewan clark » edwin clark, edward clark
ian clark » iain clark, brian clark, ann clark
a clark » a clarke, _ clark, j clark

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: ((((ian clark) OR (a clark))) OR (((((ewan clark) OR (evan clarke))) OR (edward clarke)))) (rugby union).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((ian clark) or (a clark))) or (((((ewan clark) OR (evan clarke))) or (edward clarke)))) (rugby union)".
• Adding a wildcard symbol may retrieve word variants: ((((ian clark) or (a clark))) or (((((ewan clark) OR (evan clarke))) or (edward clarke)))) (rugby union)*.