Perhaps you should try some spelling variations:
mittelbar » mittelbare, unmittelbar, ermittelbar
unmittelbare » unmittelbaree, ununmittelbare, unermittelbare, unmittelbar, ermittelbar
ermittelbare » ermittelbaree, erunmittelbare, erermittelbare, ermittelbar, mittelbare, vermittelbar
unmittelbareeee » unmittelbareeeee, ununmittelbareeee, unermittelbareeee, unmittelbareee, ermittelbareee, unmittelbaren, unmittelbarer, unmittelbarkeit
mittelbisau » mittelbau, mittelbis

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 unmittelbare) OR (ermittelbare OR unmittelbareeee)) OR mittelbisau).
• Adding a wildcard symbol may retrieve word variants: (((mittelbar or unmittelbare) or (ermittelbare or unmittelbareeee)) or mittelbisau)*.