Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierenr » passiveierenr, massivierenr, passivenierenr, passivieren, passivierender, passivierende
passiver » passiveer, massiver, passivener, passive, passiven, passiert
passively » passiveely, massively, passivenely, passive, passivity
massiverwerb » passiverwerb, massivere, massierer
massiverer » massivere, massierer, passiverer

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 ((passivierenr OR massiverwerb) OR massiverer)) OR (passiver OR passively)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((passivierenr or massiverwerb) or massiverer)) or (passiver or passively))*.