Perhaps you should try some spelling variations:
"first graph sparsification document" » "first graph classification document", "first graph clarification document", "first graph specification documents", "first graphs specification document", "first graph modification document", "first grade sparsification document", "first grand sparsification document"
"first graph specification document" » "first graph classification document", "first graph specification driven", "first graph specific document", "first graphs specification document", "first graph verification document", "first graphical specification document", "first grade specification document", "first grand specification document"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"first graph specification document\") OR (\"first graph sparsification document\"))".
• Removing quotes may allow a broader search: (( first graph specification document ) OR ( first graph sparsification document )).
• Adding a wildcard symbol may retrieve word variants: (("first graph specification document") OR ("first graph sparsification document"))*.