Perhaps you should try some spelling variations:
mittelbach » mittelbar
mittelbare » unmittelbare, unmittelbaren
ermittelbare » erunmittelbare, erunmittelbaren, ermittelbar, unmittelbare, vermittelbar
ununmittelbaren » unununmittelbaren, unununmittelbarenn, unmittelbaren, unmittelbare, unmittelbarer

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: ((unmittelbar OR mittelbach) OR ((mittelbare OR ermittelbare) OR ununmittelbaren)).
• Adding a wildcard symbol may retrieve word variants: ((unmittelbar or mittelbach) or ((mittelbare or ermittelbare) or ununmittelbaren))*.