Perhaps you should try some spelling variations:
mittelbare » unmittelbaren
unmittelbare » ununmittelbaren, unmittelbar
unmittelbarer » ununmittelbarenr, unmittelbarr, unmittelbaren, unmittelbar
ermittelbar » unmittelbar
mittelbis » mittelbaus, mittelbar, 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: ((mittelbare OR (ermittelbar OR (unmittelbare OR unmittelbarer))) OR mittelbis).
• Adding a wildcard symbol may retrieve word variants: ((mittelbare or (ermittelbar or (unmittelbare or unmittelbarer))) or mittelbis)*.