Perhaps you should try some spelling variations:
"fehler allgemeiner" » "einer allgemeinen", "oder allgemeiner", "erster allgemeiner"
"felder allgemeine" » "feld allgemeine", "bildern allgemeine", "filter allgemeines"
"deren allgemeine" » "energien allgemeine", "tumoren allgemeine", "breiten allgemeine"

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: (((("felder allgemeine") OR ("deren allgemeine"))) OR ("fehler allgemeiner"))*.
• Removing quotes may allow a broader search: (((( felder allgemeine ) or ( deren allgemeine ))) or ( fehler allgemeiner ))*.