Perhaps you should try some spelling variations:
mittelbau » mittelbach
mittelbar » ermittelbar, unmittelbare
mittelbare » ermittelbare, unmittelbaree, unmittelbare, unmittelbaren
ununmittelbareee » ununermittelbareee, unununmittelbareeee, unununmittelbareee, unununmittelbarenee, unmittelbare, unmittelbaren, unmittelbarer
unmittelbar » unermittelbar, ununmittelbare

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