Perhaps you should try some spelling variations:
mittelbar » unmittelbar
unmittelbare » ununmittelbare, unmittelbar, ununmittelbaren
ermittelbar » erunmittelbar, unmittelbar
unermittelbar » unerunmittelbar, ununmittelbar, unvermittelbar, unvermittelbare, unmittelbar
mittelbare » unmittelbare, unmittelbaren
unmittelbarn » ununmittelbarn, unmittelbaren, unmittelbar, unmittelbarer

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