Perhaps you should try some spelling variations:
graph ramsey » graphs ramsey, frank ramsey
john roy » john ray, john rob, john leroy
john roe » john rose, john rowe, john rolle
raja r » raja _, raja j, raja m
r kwon » _ kwon, o kwon, c kwon
kwon o » kwon _, kwon 4, kwon j

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: (( graph ramsey ((john roy) OR (john roe)) ) OR ( raja r kwon o )).
• Adding a wildcard symbol may retrieve word variants: (( graph ramsey ((john roy) or (john roe)) ) or ( raja r kwon o ))*.