Perhaps you should try some spelling variations:
passiver » passive, passiert
passiven » passive, passion
passively » massively, passive, passivity, passivey, possively, passivesy
passivel » passive, possivel, passives

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 (passiven OR passively)) OR passivel).
• Adding a wildcard symbol may retrieve word variants: ((passiver or (passiven or passively)) or passivel)*.