Perhaps you should try some spelling variations:
passiv » passiven
passiver » passivener, passiven, passively, passiert
passivener » passivenener, passiverer, passiven, passiverwerb
passive » passivene
passivierende » passivenierende, passivierender, passivieren, aktivierende
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 (passiver OR passivener)) OR passive) OR massiv) OR passivierende).
• Adding a wildcard symbol may retrieve word variants: ((((passiv or (passiver or passivener)) or passive) or massiv) or passivierende)*.