Perhaps you should try some spelling variations:
mittelbar » mittelbare, ermittelbar, unmittelbare
unmittelbar » unmittelbare, unermittelbar, ununmittelbare
unmittelbaren » unmittelbareen, unermittelbaren, ununmittelbareen, unmittelbare
ununmittelbareeen » ununmittelbareeeen, ununermittelbareeen, unununmittelbareeeen, unmittelbarsten
mittelbach » mittelbare

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 mittelbach) OR (unmittelbar OR (unmittelbaren OR ununmittelbareeen))).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbach) or (unmittelbar or (unmittelbaren or ununmittelbareeen)))*.