Perhaps you should try some spelling variations:
passiver » passive, passiven, passiert
passively » massively, passive, passivity
passivierenn » passivieren, passivierenden, passivierende
passivene » passiven, passiverer, passive
passiveand » 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 passively) OR (passion OR passivierenn)) OR (passivene OR passiveand)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiver OR passively) or (passion or passivierenn)) or (passivene or passiveand))".
• Adding a wildcard symbol may retrieve word variants: (((passiver OR passively) or (passion or passivierenn)) or (passivene or passiveand))*.