Perhaps you should try some spelling variations:
mittelbar » mittelbare, ermittelbar
unmittelbare » unmittelbaree, unermittelbare, ermittelbar
unmittelbar » unmittelbare, unermittelbar
unmittelbareen » unmittelbareeen, unermittelbareen, ermittelbaren, unmittelbareren, unmittelbaren, unmittelbarsten
mittelbach » mittelbare

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 mittelbach) OR (unmittelbare OR (unmittelbar OR unmittelbareen))).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbach) or (unmittelbare or (unmittelbar or unmittelbareen)))*.