Perhaps you should try some spelling variations:
passiveen » passiven, passiveand, passively
passiverer » passiverwerb, passieren, passagerer, passivener, passivelyer, passierter
passiver » passiven, passively, passiert
passivieren » passivierende, passivierung, passieren

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