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 ramsey john robb", "graph ramsey john r.b", "graph ramsey john robst"
"graph ramsey john roe" » "graphs ramsey john roe", "frank ramsey john roe", "graph ramsay john roe", "graph casey john roe", "graph ramsey john rose", "graph ramsey john rowe", "graph ramsey john rolle"
"raja m mohon roy" » "raja m cohen roy", "raja m mon roy", "raja m mohan roy", "raja m moxon roy", "raja m morton roy", "raja _ mohon roy", "raja j mohon roy", "raja r 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 ("graph ramsey john roe"))) OR ("raja m mohon roy")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"graph ramsey john rob\") OR (\"graph ramsey john roe\"))) or (\"raja m mohon roy\"))".
• Removing quotes may allow a broader search: (((( graph ramsey john rob ) OR ( graph ramsey john roe ))) or ( raja m mohon roy )).
• Adding a wildcard symbol may retrieve word variants: (((("graph ramsey john rob") OR ("graph ramsey john roe"))) or ("raja m mohon roy"))*.