Perhaps you should try some spelling variations:
"graph ramsey john rob" » "graphs ramsey john rob", "frank ramsey john rob", "graph ramsay john rob", "graph casey john rob", "graph bradley john rob", "graph ramsey john robb", "graph ramsey john r.b", "graph ramsey john roe"
"raja r mohon roy" » "raja r cohen roy", "raja r mon roy", "raja r mohan roy", "raja _ mohonk roy", "raja r morton roy", "raja _ mohon roy", "raja j mohon roy", "raja m mohon 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 ("raja r mohon roy")).
• Removing quotes may allow a broader search: (( graph ramsey john rob ) or ( raja r mohon roy )).
• Adding a wildcard symbol may retrieve word variants: (("graph ramsey john rob") or ("raja r mohon roy"))*.