Perhaps you should try some spelling variations:
"bildung allgemeiner" » "bildung allgemein", "geltung allgemeiner", "abbildungen allgemeiner"
"fehler allgemeiner" » "einer allgemeinen", "oder allgemeiner", "erster allgemeiner"
"felder allgemeine" » "feld allgemeine", "bildern allgemeine", "filter allgemeines"

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 ("fehler allgemeiner"))) OR ("bildung allgemeiner"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"felder allgemeine\") OR (\"fehler allgemeiner\"))) or (\"bildung allgemeiner\"))*".
• Removing quotes may allow a broader search: (((( felder allgemeine ) OR ( fehler allgemeiner ))) or ( bildung allgemeiner ))*.