Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar, unmittelbare
mittelbare » unmittelbare, ermittelbare, unmittelbaree
unmittelbaren » ununmittelbaren, unermittelbaren, ununmittelbareen, unmittelbare, unmittelbar
ununmittelbaree » unununmittelbaree, ununermittelbaree, unununmittelbareee, unmittelbare, unmittelbarer, unmittelbarem

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 ((mittelbare OR unmittelbaren) OR ununmittelbaree)).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbach) or ((mittelbare or unmittelbaren) or ununmittelbaree))*.