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