Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passivieren, passiverer, passiven
massiv » massive
passieren » passiert, passiven
massiger » massinger, massive, massie
massigeren » massingeren, massiveen, massieen, massigen, massivere, massierer

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