Perhaps you should try some spelling variations:
mittelbar » ermittelbar
unmittelbar » unermittelbar
unmittelbare » unermittelbare, ermittelbar
unermittelbar » unerermittelbar, unvermittelbar, unvermittelbare, ermittelbar
mittelbare » ermittelbare
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 unmittelbar) OR (unmittelbare OR unermittelbar)) OR mittelbare)) OR unmittelbaren).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbach or (((mittelbar OR unmittelbar) or (unmittelbare or unermittelbar)) or mittelbare)) or unmittelbaren)".
• Adding a wildcard symbol may retrieve word variants: ((mittelbach or (((mittelbar OR unmittelbar) or (unmittelbare or unermittelbar)) or mittelbare)) or unmittelbaren)*.