Perhaps you should try some spelling variations:
graph ramsey » graphs ramsey, frank ramsey
john roy » john ray, john roe, john leroy
john rob » john robb, john r.b, john roe
kwon roy » kwon o, kwon go, kwon ho
raja r » raja _, raja j, raja m
r kwon » _ kwon, o kwon, c kwon

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 rob)) ) OR ( raja r kwon roy )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( graph ramsey ((john roy) OR (john rob)) ) or ( raja r kwon roy ))".
• Adding a wildcard symbol may retrieve word variants: (( graph ramsey ((john roy) OR (john rob)) ) or ( raja r kwon roy ))*.