Perhaps you should try some spelling variations:
mittelbau » mittelbar, mittelbare, mittelbach
mittelbaus » mittelbars, mittelbares, mittelbachs, mittelballs, mittelbare
mittelbauar » mittelbarar, mittelbarear, mittelbachar, mittelbar, mittelbarer, mittelbedarf
mittelbarau » mittelbare, mittelbar, mittelbaren

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 mittelbaus) OR mittelbauar) OR mittelbarau).
• Adding a wildcard symbol may retrieve word variants: (((mittelbau or mittelbaus) or mittelbauar) or mittelbarau)*.