Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passagieren
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passiver, passagerer
passieren » passiert, passiven
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 (passieren OR passivieren)) OR massiv) OR passiverer).
• Adding a wildcard symbol may retrieve word variants: (((passiv or (passieren or passivieren)) or massiv) or passiverer)*.