Perhaps you should try some spelling variations:
massiv » massive
massivere » massiveere, massiver, massive, massively
passiveren » passivieren, passieren, passiven
passiverer » passiverwerb, passivieren, passiver
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: ((passive OR massiv) OR ((passiveren OR passiverer) OR (massiger OR massivere))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passive or massiv) or ((passiveren OR passiverer) or (massiger or massivere)))".
• Adding a wildcard symbol may retrieve word variants: ((passive or massiv) or ((passiveren OR passiverer) or (massiger or massivere)))*.