Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiver » passiveer, massiver, passivener, passive, passiven, passively
passiverer » passiveerer, massiverer, passivenerer, passiveer, passivener, passivelyer, passiverwerb, passivieren, passieren

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