Perhaps you should try some spelling variations:
unmittelbare » unmittelbar, unmittelbaree, ununmittelbare
erunmittelbare » erunmittelbar, ermittelbare, unmittelbar, unmittelbaren, erunmittelbaree, erununmittelbare
ermittelbar » unmittelbar, ermittelbare, erunmittelbar
mittelbau » mittelbare, mittelbach
mittelbar » mittelbare, 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: ((unmittelbare OR (ermittelbar OR erunmittelbare)) OR (mittelbau OR mittelbar))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((unmittelbare or (ermittelbar or erunmittelbare)) or (mittelbau OR mittelbar))*".