Perhaps you should try some spelling variations:
graph ramsey » graphs ramsey, frank ramsey
ramsey john » ramsay john, casey john
john rob » john robb, john r.b, john roe
mon roy » von roy, mohon roy, kwon roy
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 rob ) OR ( ((raja r) OR (raja _)) mon roy )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( graph ramsey john rob ) or ( ((raja r) OR (raja _)) mon roy ))".
• Adding a wildcard symbol may retrieve word variants: (( graph ramsey john rob ) or ( ((raja r) OR (raja _)) mon roy ))*.