Perhaps you should try some spelling variations:
mittelbar » mittelbare, unmittelbar, ermittelbar
erunmittelbar » erunmittelbare, erununmittelbar, erunermittelbar, unmittelbar, ermittelbar, unmittelbare
erunermittelbar » erunermittelbare, erunerunmittelbar, erunerermittelbar, unvermittelbar
erunmittelbare » erunmittelbaree, erununmittelbare, erunermittelbare, unmittelbare, ermittelbare, unmittelbaree, unmittelbar
mittelbau » mittelbare, mittelbach

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: ((mittelbar OR ((erunmittelbar OR erunermittelbar) OR erunmittelbare)) OR mittelbau)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbar or ((erunmittelbar OR erunermittelbar) or erunmittelbare)) or mittelbau)*".