Perhaps you should try some spelling variations:
graph ramsey » graphs ramsey, frank ramsey
ramsey john » ramsay john, casey john, bradley john
john rob » john robb, john r.b, john roe
r mon » _ mon, o mon, r mod
a mon » a monk, a mono, a man

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