Perhaps you should try some spelling variations:
mittelbar » unmittelbar, unmittelbare
mittelbare » unmittelbare, unmittelbaree, unmittelbaren
ermittelbar » erunmittelbar, erunmittelbare, unmittelbar, unmittelbare
unununmittelbareee » ununununmittelbareee, ununununmittelbareeee, ununununmittelbarenee
unmittelbareer » ununmittelbareer, ununmittelbareeer, ununmittelbarener, unmittelbarer, unmittelbare, unmittelbaren
mittelbis » mittelbaus, mittelbau

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