Perhaps you should try some spelling variations:
graph ramsey » graphs ramsey, frank ramsey
john rose » john rice
john roe » john rowe, john rolle, john roger
kwon ho » kwon o, koon ho, kwon go
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 roe) OR (john rose)) ) OR ( raja r kwon ho )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( graph ramsey ((john roe) OR (john rose)) ) or ( raja r kwon ho ))".
• Adding a wildcard symbol may retrieve word variants: (( graph ramsey ((john roe) OR (john rose)) ) or ( raja r kwon ho ))*.