Perhaps you should try some spelling variations:
passiven » passive, passion
passiveren » passageren, massivere, passivierende, passiveen, passivelyen, passierten
passivieren » passivierende, passivierung, passagieren
passiver » passive, passively, passiert
passiverer » passiveer, passivelyer, passierter, passiverwerb, passagerer, massivere
massigeren » massiger, massigen, massivere
passiveeren » passivierende, passivierung
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: (passiven OR (((passiveren OR passivieren) OR passiver) OR (massigeren OR ((passiveeren OR passieren) OR passiverer)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiven or (((passiveren OR passivieren) or passiver) or (massigeren or ((passiveeren or passieren) or passiverer))))".
• Adding a wildcard symbol may retrieve word variants: (passiven or (((passiveren OR passivieren) or passiver) or (massigeren or ((passiveeren or passieren) or passiverer))))*.