Perhaps you should try some spelling variations:
mittelbar » mittelbare, unmittelbar
ermittelbar » ermittelbare, erunmittelbar, unmittelbar
unmittelbare » unmittelbaree, ununmittelbare, unmittelbar
unununmittelbareee » unununmittelbareeee, ununununmittelbareee, unununmittelbaree
unmittelbareer » unmittelbareeer, ununmittelbareer, unmittelbarer, unmittelbareren, 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 ((ermittelbar OR unmittelbare) OR (unununmittelbareee OR unmittelbareer))) OR mittelbis).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbar or ((ermittelbar OR unmittelbare) or (unununmittelbareee or unmittelbareer))) or mittelbis)".
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or ((ermittelbar OR unmittelbare) or (unununmittelbareee or unmittelbareer))) or mittelbis)*.