Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivereren » passiveereren, passivenereren, passiverereren, passivieren, passiverer, passivierenden
massiv » massive
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 (passivereren OR (massiger OR massigeren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passivereren or (massiger or massigeren)))*.