Perhaps you should try some spelling variations:
passiv » passive, passiver
passiveren » passiveeren, passivereren, passivieren, passieren, passiverer
passiven » passiveen, passiveren, passive, passion
massiven » massive, massively, massiveen
massiv » massive

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 (massiven OR massiv))) OR passiven)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passiveren or (massiven OR massiv))) or passiven)*".