Perhaps you should try some spelling variations:
mittelbar » mittelbare, unmittelbar, ermittelbar
unmittelbare » unmittelbaree, ununmittelbare, unermittelbare, unmittelbar, ermittelbar
unermittelbarn » unermittelbaren, unerunmittelbarn, unerermittelbarn, unvermittelbare, unvermittelbar, unmittelbar
unmittelbareen » unmittelbareeen, ununmittelbareen, unermittelbareen, unmittelbaren, ermittelbaren, unmittelbarsten, unmittelbarer
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 (unmittelbare OR (unermittelbarn OR unmittelbareen))).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbach) or (unmittelbare or (unermittelbarn or unmittelbareen)))*.