Perhaps you should try some spelling variations:
mittelbar » unmittelbar, ermittelbar, unmittelbare
mittelbare » unmittelbare, ermittelbare, unmittelbaree, unmittelbaren
erunmittelbare » erununmittelbare, erunermittelbare, erununmittelbaree, erununmittelbaren, unmittelbare, ermittelbare, unmittelbar
unununmittelbarenn » ununununmittelbarenn, unununermittelbarenn, ununununmittelbareenn, ununununmittelbarennn

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 mittelbach) OR ((mittelbare OR erunmittelbare) OR unununmittelbarenn)).
• Adding a wildcard symbol may retrieve word variants: ((mittelbar or mittelbach) or ((mittelbare or erunmittelbare) or unununmittelbarenn))*.