Perhaps you should try some spelling variations:
passiveen » passiven, passiveand, passives
passively » passivity, passiven
massively » massive
passiverer » passiverwerb, passieren, passagerer, passivener, passierter
passiver » passiven, 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 passively) OR massively) OR ((passiverer OR passiver) OR passivieren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passive or (((passiveen OR passively) or massively) or ((passiverer or passiver) or passivieren)))".
• Adding a wildcard symbol may retrieve word variants: (passive or (((passiveen OR passively) or massively) or ((passiverer or passiver) or passivieren)))*.