Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
massiv » massive
massivere » massiveere, massiver, massive, massively
passieren » passiert
massiger » massive, massie, massig
massinger » massiver, massing

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