Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiver » massiver, passivener, passiven, passively, passiert
passive » massive, passivene
passiverer » massiverer, passivenerer, passivener, passivelyer, passierter, passiverwerb, passivieren, passieren
massivere » massiver, massive, massively

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 ((passive OR passiverer) OR massivere)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passiver) or ((passive or passiverer) or massivere))*.