Perhaps you should try some spelling variations:
"graph ramsey john rob" » "graphs ramsey john rob", "frank ramsey john rob", "graph ramsay john rob", "graph ramsey john robb", "graph ramsey john r.b", "graph ramsey john roe"
"graph casey john rob" » "graph case john rob", "graph based john rob", "gray casey john rob", "graph carey john rob", "graph cawley john rob", "graph casey john robb", "graph casey john r.b", "graph casey john roe"
"raja m mohon roy" » "raja m cohen roy", "raja m mon roy", "raja m mohan roy", "raja m morton roy", "raja _ mohonk roy", "raja _ mohon roy", "raja j mohon roy", "raja r mohon roy"
"raja m moxon roy" » "raja m mon roy", "raja mr moxon roy", "raja j moxon roy", "raja m oxon roy", "raja _ moxon roy", "raja r moxon 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 rob") OR ("graph casey john rob"))) OR ((("raja m mohon roy") OR ("raja m moxon roy")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"graph ramsey john rob\") OR (\"graph casey john rob\"))) or (((\"raja m mohon roy\") or (\"raja m moxon roy\"))))".
• Removing quotes may allow a broader search: (((( graph ramsey john rob ) OR ( graph casey john rob ))) or ((( raja m mohon roy ) or ( raja m moxon roy )))).
• Adding a wildcard symbol may retrieve word variants: (((("graph ramsey john rob") OR ("graph casey john rob"))) or ((("raja m mohon roy") or ("raja m moxon roy"))))*.