Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar
mittelbare » unmittelbare, ermittelbare
unmittelbare » ununmittelbare, unermittelbare, unmittelbar, ermittelbar
unmittelbaren » ununmittelbaren, unermittelbaren, unmittelbarn, ermittelbarn, unmittelbar

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