Perhaps you should try some spelling variations:
massiv » massive
massiven » massiveen, massive, passiven, massively
massiver » massiveer, massive, massively, massie
passivere » passiverer, massivere, passivieren, passivee, passivene, passivelye
passiver » passive, passiven, passively

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