Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar, unmittelbare
mittelbare » unmittelbare, ermittelbare, unmittelbaree
unmittelbaree » ununmittelbaree, unermittelbaree, ununmittelbareee, unmittelbare, unmittelbarer, unmittelbarem
unmittelbaren » ununmittelbaren, unermittelbaren, ununmittelbareen, unmittelbare, unmittelbar
unmittelbareee » ununmittelbareee, unermittelbareee, ununmittelbareeee, unmittelbaree, unmittelbarere, unmittelbareme, unmittelbareren, unmittelbare, unmittelbarer

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 mittelbare) OR ((unmittelbaree OR unmittelbaren) OR unmittelbareee)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbar or mittelbare) or ((unmittelbaree OR unmittelbaren) or unmittelbareee))".
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbare) or ((unmittelbaree OR unmittelbaren) or unmittelbareee))*.