Perhaps you should try some spelling variations:
mittelbar » ermittelbar
unmittelbare » unermittelbare, ermittelbar
unmittelbar » unermittelbar
mittelbare » ermittelbare
ermittelbare » erermittelbare, ermittelbar, vermittelbar, unmittelbarer
unmittelbaren » unermittelbaren, ermittelbarn

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: ((mittelbach OR ((mittelbar OR (unmittelbare OR unmittelbar)) OR (mittelbare OR ermittelbare))) OR unmittelbaren).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbach or ((mittelbar or (unmittelbare OR unmittelbar)) or (mittelbare or ermittelbare))) or unmittelbaren)".
• Adding a wildcard symbol may retrieve word variants: ((mittelbach or ((mittelbar or (unmittelbare OR unmittelbar)) or (mittelbare or ermittelbare))) or unmittelbaren)*.