Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passiveren » passiveeren, passivereren, passivieren, passiverer, passiver
massiv » massive
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 massiv) OR ((passiven OR passiveren) OR passieren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or ((passiven OR passiveren) or passieren))*".