Perhaps you should try some spelling variations:
"graph ramsey john roe" » "graphs ramsey john roe", "frank ramsey john roe", "graph ramsay john roe", "graph casey john roe", "graph bradley john roe", "graph ramsey john rose", "graph ramsey john rowe", "graph ramsey john rolle"
"raja m morton roy" » "raja m morton from", "raja m mohon roy", "raja m morton o", "raja mr morton roy", "raja _ morton roy", "raja j morton roy", "raja r morton 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 roe") OR ("raja m morton roy")).
• Removing quotes may allow a broader search: (( graph ramsey john roe ) or ( raja m morton roy )).
• Adding a wildcard symbol may retrieve word variants: (("graph ramsey john roe") or ("raja m morton roy"))*.