Perhaps you should try some spelling variations:
"graph ramsey john r.b" » "graphs ramsey john r.b", "frank ramsey john r.b", "graph ramsay john r.b", "graph casey john r.b", "graph ramsey john robb", "graph ramsey john ray", "graph ramsey john rev"
"raja r kwon roy" » "raja r kwon o", "raja r kwon go", "raja r kwon ho", "raja _ kwon roy", "raja j kwon roy", "raja m kwon roy", "raja o kwon roy", "raja c kwon roy"
"raja r mon roy" » "raja r von roy", "raja r mohon roy", "raja _ mon roy", "raja j mon roy", "raja m mon roy", "raja a mon roy", "raja o mon roy"

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