Perhaps you should try some spelling variations:
mittelbau » mittelbach
mittelbar » unmittelbar, ermittelbar
mittelbare » unmittelbare, ermittelbare
unmittelbare » ununmittelbare, unermittelbare, unmittelbar, ermittelbar
unmittelbaren » ununmittelbaren, unermittelbaren, unmittelbarn, ermittelbarn, unmittelbar

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