Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivene » passiveene, massivene, passivenene, passiven, passiveand, passiverer
passivelyer » passiveelyer, massivelyer, passivenelyer, passively, passiverer
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb, passiverer
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
aktivieren » aktivierung, motivieren

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: ((passiv OR passivene) OR ((passivelyer OR passiverwerb) OR (passivieren OR aktivieren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passivene) or ((passivelyer or passiverwerb) or (passivieren or aktivieren)))*.