Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
passiverer » passiveerer, massiverer, passivenerer, passiverwerb, passiver, passieren
massiveen » massiven, massivement, massivsten

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 ((passivieren OR massiveen) OR passiverer)).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passivieren or massiveen) or passiverer))*.