Perhaps you should try some spelling variations:
passiven » passive, passion
passiveren » passiver, passageren, massivere
passivieren » passivierende, passivierung, passagieren
massigeren » massigen, massivere, massierer, massingeren, massiveen, massieen
massiger » massinger, massive, massie
passiveeren » passivierende, passivierung
passieren » passiert
passiverer » passiverwerb, passiver, passagerer

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 ((massigeren OR massiger) 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 ((massigeren or massiger) or ((passiveeren or passieren) or passiverer))))".
• Adding a wildcard symbol may retrieve word variants: (passiven or ((passiveren OR passivieren) or ((massigeren or massiger) or ((passiveeren or passieren) or passiverer))))*.