Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
massiv » massive
massiven » massiveen, massive, massively
massigeren » massigen, massivere, massierer, massingeren, massiveen, massieen
massiger » massinger, massive, massie

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