Perhaps you should try some spelling variations:
passiver » passive, passiven, passiert
passiveren » passiveen, passivenen, passierten, passivieren, passieren, passiverer, passiverern, massiveren, passivierenn
passivere » passivee, passivene, passierte, passiverer, massivere, passivieren
passively » massively, passive, passivity

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