Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveren » passiveeren, massiveren, passivereren, passiverer, passiver, passageren
passivieren » passiveieren, massivieren, passiverieren, passivierung, passagieren, passivierender
passivierende » passiveierende, massivierende, passiverierende, passivierungde, passagierende, passivierenderde, passivierender, aktivierende, passivierung
massiveeren » massivere, massigeren, massivdecken
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 passiveren) OR (massivement OR (((passivieren OR passivierende) OR massiveeren) OR passieren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((passiven or passiveren) or (massivement or (((passivieren OR passivierende) or massiveeren) or passieren))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passiven or passiveren) or (massivement or (((passivieren OR passivierende) or massiveeren) or passieren))))*.