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