Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveren » passiveeren, massiveren, passivereren, passieren, passiverer, passiver
passiveeren » passiveeeren, massiveeren, passivereeren, passieren, passiverer, passivierende
passiveeeren » passiveeeeren, massiveeeren, passivereeeren, passieren, passiverer
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passieren
massiveren » massivere, massigeren, massivement

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 (massiveren OR (passiveeren OR (passiveeeren OR passivieren))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((passiven or passiveren) or (massiveren or (passiveeren or (passiveeeren OR passivieren)))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passiven or passiveren) or (massiveren or (passiveeren or (passiveeeren OR passivieren)))))*.