Perhaps you should try some spelling variations:
passiv » passive, massiv
passiven » passiveen, massiven, passive
passiver » passiveer, massiver, passive, passively, passiert
passiverwerb » passiveerwerb, massiverwerb, passivewerb, passivelywerb, passiertwerb, passiverer
passiveand » passiveeand, massiveand
massiver » massive, massiven, massively

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: (((passiv OR passiven) OR ((passiver OR massiver) OR passiverwerb)) OR (passion OR passiveand)).
• Adding a wildcard symbol may retrieve word variants: (((passiv or passiven) or ((passiver or massiver) or passiverwerb)) or (passion or passiveand))*.