Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
passiverer » passiveer, passivener, passivelyer, passiverwerb, passivieren, passieren
massiv » massive
massiven » massiveen, massive, passiven, massively
passiveer » passiviert, passive, passiven

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