Perhaps you should try some spelling variations:
"einer original conference" » "einer regional conference", "einer retinal conference", "einer regional conferences", "eines originals conference", "either original conference", "einer ordinal conference"
"ein original reference" » "ein original references", "ein regional reference", "ein origin references", "sin original reference", "being original reference", "own original reference"
"near marginal references" » "under marginal references", "a marginal references", "left marginal references"

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: "((((\"einer original conference\") OR (\"ein original reference\"))) OR (\"near marginal references\"))".
• Removing quotes may allow a broader search: (((( einer original conference ) OR ( ein original reference ))) OR ( near marginal references )).
• Adding a wildcard symbol may retrieve word variants: (((("einer original conference") OR ("ein original reference"))) OR ("near marginal references"))*.