Perhaps you should try some spelling variations:
passiven » passive, passion
passiveren » passivieren, passageren, massivere, passiveen, passivelyen, passierten
passiver » passive, passively, passiert
passiverer » passiveer, passivelyer, passierter, passiverwerb, passivieren, passagerer
massigeren » massiger, massigen, massivere
passiveeren » passivieren, 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 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 passiver) or (massigeren or ((passiveeren or passieren) or passiverer))))".
• Adding a wildcard symbol may retrieve word variants: (passiven or ((passiveren OR passiver) or (massigeren or ((passiveeren or passieren) or passiverer))))*.