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

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