Perhaps you should try some spelling variations:
original reference » original references, original conference, regional reference
einer original » eines originals, either original, ein original
near marginal » under marginal, a marginal, left marginal

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: (((( einer original reference ) OR ( sin original reference ))) OR ( near marginal references )).
• Adding a wildcard symbol may retrieve word variants: (((( einer original reference ) or ( sin original reference ))) or ( near marginal references ))*.