Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar, unmittelbare
ununmittelbare » unununmittelbare, ununermittelbare, unununmittelbaree, unmittelbare, unvermittelbare, unmittelbar
mittelbare » unmittelbare, ermittelbare, unmittelbaree
unmittelbaren » ununmittelbaren, unermittelbaren, ununmittelbareen, unmittelbare, unmittelbar
ununmittelbaren » unununmittelbaren, ununermittelbaren, unununmittelbareen, unmittelbaren, unvermittelbaren, unmittelbarn, ununmittelbare, ununmittelbar, unmittelbare, unmittelbarer, 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: ((mittelbach OR ((mittelbar OR (ununmittelbare OR ununmittelbare)) OR mittelbare)) OR (unmittelbaren OR ununmittelbaren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mittelbach or ((mittelbar or (ununmittelbare or ununmittelbare)) or mittelbare)) or (unmittelbaren OR ununmittelbaren))".
• Adding a wildcard symbol may retrieve word variants: ((mittelbach or ((mittelbar or (ununmittelbare or ununmittelbare)) or mittelbare)) or (unmittelbaren OR ununmittelbaren))*.