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

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 passive) OR massivene) OR ((passiverer OR passieren) OR (passiver OR passivener))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passive) or massivene) or ((passiverer or passieren) or (passiver or passivener)))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passive) or massivene) or ((passiverer or passieren) or (passiver or passivener)))*.