Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar, unmittelbare
mittelbare » unmittelbare, ermittelbare, unmittelbaree
erunmittelbare » erununmittelbare, erunermittelbare, erununmittelbaree, unmittelbare, ermittelbare, unmittelbar
ununmittelbareee » unununmittelbareee, ununermittelbareee, unununmittelbareeee, unmittelbare, unmittelbarer, unmittelbarem
unmittelbaren » ununmittelbaren, unermittelbaren, ununmittelbareen, unmittelbare, unmittelbar
unmittelbareen » ununmittelbareen, unermittelbareen, ununmittelbareeen, unmittelbareren, unmittelbarsten, unmittelbare
mittelbisau » mittelbau, mittelbis

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