Perhaps you should try some spelling variations:
passiv » passiven
passive » passivene
passivieren » passivenieren, passivierende, passivierung, passieren
passiver » passivener, passiven, passively, passiert
passivener » passivenener, passiverer, passiven, passiverwerb
massiv » massive

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