Perhaps you should try some spelling variations:
mittelbar » mittelbare, unmittelbar
unmittelbare » unmittelbaree, ununmittelbare, unmittelbar
ermittelbar » ermittelbare, erunmittelbar, unmittelbar
unmittelbareeee » unmittelbareeeee, ununmittelbareeee, unmittelbareee, 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 (ermittelbar OR unmittelbareeee)) OR mittelbisau).
• Adding a wildcard symbol may retrieve word variants: (((mittelbar or unmittelbare) or (ermittelbar or unmittelbareeee)) or mittelbisau)*.