Perhaps you should try some spelling variations:
edward clarke » edward coke, edward cooke
ewan clark » edwin clark, evan clarke, edward clark
ian clark » iain clark, brian clark, ann clark
a clarke » _ clarke, h clarke, dr clarke
a clark » _ clark, j clark, e 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 (a clarke))))) OR (((ewan clark) OR (edward clarke)))) (rugby union).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((ian clark) or (((a clark) OR (a clarke))))) or (((ewan clark) or (edward clarke)))) (rugby union)".
• Adding a wildcard symbol may retrieve word variants: ((((ian clark) or (((a clark) OR (a clarke))))) or (((ewan clark) or (edward clarke)))) (rugby union)*.