Perhaps you should try some spelling variations:
mittelbar » unmittelbar, unmittelbare
mittelbare » unmittelbare, unmittelbaree
ermittelbar » erunmittelbar, erunmittelbare, unmittelbar
unmittelbaree » ununmittelbaree, ununmittelbareee, unmittelbare, unmittelbarer, unmittelbarem
unmittelbaren » ununmittelbaren, ununmittelbareen, unmittelbare, unmittelbar
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 mittelbare) OR (ermittelbar OR (unmittelbaree OR unmittelbaren))) OR mittelbisau).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((mittelbar OR mittelbare) or (ermittelbar or (unmittelbaree or unmittelbaren))) or mittelbisau)".
• Adding a wildcard symbol may retrieve word variants: (((mittelbar OR mittelbare) or (ermittelbar or (unmittelbaree or unmittelbaren))) or mittelbisau)*.