Perhaps you should try some spelling variations:
graph ramsey » graphs ramsey, frank ramsey
ramsey john » ramsay john, casey john, bradley john
john roe » john rose, john rowe, john rolle
r kwon » _ kwon, o kwon, g kwon
c kwon » _ kwon, o kwon, c kwok

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