Perhaps you should try some spelling variations:
passiv » passive, massiv
passiverer » passiveerer, massiverer, passiverwerb, passivieren, passagerer, passiveer, passivelyer, passierter
passiver » passiveer, massiver, passive, passively, passiert
passivener » passiveener, massivener, passiverwerb, passiveer, passioner
passiven » passiveen, massiven, passive, passion
massivene » massiven, massivere, massive
passieren » passiert

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