Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiverer » passiveerer, massiverer, passivererer, passiverwerb, passivieren, passiver
massiven » massive, massively, massiv
massigen » massiger, massigung, massie, massigern, massign
massige » massiger, massig
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 ((passiven OR massiven) OR ((massigen OR massige) OR (passiverer OR passieren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((passiven or massiven) or ((massigen OR massige) or (passiverer or passieren))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passiven or massiven) or ((massigen OR massige) or (passiverer or passieren))))*.