Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiverere » passiveerere, massiverere, passivererere, passiverer, passiverwerb, passivierende
passiven » passiveen, massiven, passiveren, passive, passion
massiven » massive, massively, massiv

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 massiven) OR (passiverere OR passiven)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiven) or (passiverere or passiven))*.