Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveren » passiveeren, massiveren, passiveneren, passivieren, passiverer, passiven
passiveeren » passiveeeren, massiveeren, passiveneeren, passivieren, passiverer, passivierende
passieren » passiert, passiven

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