Perhaps you should try some spelling variations:
mittelbar » mittelbare, ermittelbar
unmittelbar » unmittelbare, unermittelbar
unmittelbareem » unmittelbareeem, unermittelbareem, unmittelbarem, unmittelbarstem, unmittelbaren, ermittelbarem
unmittelbare » unmittelbaree, unermittelbare, ermittelbar
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 (unmittelbareem OR unmittelbare))) OR mittelbisau).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or (unmittelbar or (unmittelbareem or unmittelbare))) or mittelbisau)*.