Perhaps you should try some spelling variations:
mittelbar » mittelbare, ermittelbar, unmittelbare
unmittelbar » unmittelbare, unermittelbar, ununmittelbare
unmittelbaren » unmittelbareen, unermittelbaren, ununmittelbareen, unmittelbare
unermittelbaren » unermittelbareen, unerermittelbaren, unerunmittelbareen, ermittelbaren, unvermittelbare, unmittelbare
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 (unmittelbar OR (unmittelbaren OR unermittelbaren))) OR mittelbisau).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbar or (unmittelbar or (unmittelbaren OR unermittelbaren))) or mittelbisau)".
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or (unmittelbar or (unmittelbaren OR unermittelbaren))) or mittelbisau)*.