Perhaps you should try some spelling variations:
mittelbar » mittelbare, ermittelbar, unmittelbare
ermittelbaree » ermittelbareee, erermittelbaree, erunmittelbareee, ermittelbare, ermittelbaren, ermittelbar
unmittelbar » unmittelbare, unermittelbar, ununmittelbare
vermittelbar » vermittelbare, verermittelbar, verunmittelbare, ermittelbar, vermittelter, vermittelnder

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 ermittelbaree) OR ((unmittelbar OR vermittelbar) OR unmittelbar)).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or ermittelbaree) or ((unmittelbar or vermittelbar) or unmittelbar))*.