Perhaps you should try some spelling variations:
mittelbar » mittelbare, unmittelbar
ermittelbare » ermittelbaree, erunmittelbare, mittelbare, vermittelbar, unmittelbaren, unmittelbare
ermittelbar » ermittelbare, erunmittelbar, unmittelbar
mittelbaree » mittelbareee, unmittelbaree, mittelbare, mittelbaren, mittelbarer
unmittelbare » unmittelbaree, ununmittelbare, unmittelbar
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 (((ermittelbare OR ermittelbar) OR mittelbaree) OR unmittelbare)).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbach) or (((ermittelbare or ermittelbar) or mittelbaree) or unmittelbare))*.