Perhaps you should try some spelling variations:
passiv » passive, passiver
passiverer » passiveerer, passivererer, passiverwerb, passivieren, passiver
passiveren » passiveeren, passivereren, passivieren, passieren, passiver
passiven » passiveen, passiveren, passive, passion
massiv » massive

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 passiverer) OR passiveren) OR massiv) OR passiven).
• Adding a wildcard symbol may retrieve word variants: ((((passiv or passiverer) or passiveren) or massiv) or passiven)*.