Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar
mittelbare » unmittelbare, ermittelbare, unmittelbaren
unmittelbare » ununmittelbare, unermittelbare, ununmittelbaren, unmittelbar, ermittelbar
unmittelbarer » ununmittelbarer, unermittelbarer, ununmittelbarenr, unmittelbarr, ermittelbarr, unmittelbaren, unmittelbar
unmittelbareee » ununmittelbareee, unermittelbareee, ununmittelbarenee, unmittelbaree, ermittelbaree, unmittelbareren, unmittelbaren, unmittelbarem

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