Perhaps you should try some spelling variations:
passiv » passiver
passiven » passiveren, passion
passiverer » passivererer, passiverwerb, passiver, passieren
passive » passivere
passivieren » passiverieren, passivierende, passivierung, passieren
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 (passiven OR passiverer)) OR passive) OR massiv) OR passivieren).
• Adding a wildcard symbol may retrieve word variants: ((((passiv or (passiven or passiverer)) or passive) or massiv) or passivieren)*.