Perhaps you should try some spelling variations:
passiven » passive, passion
passiveneer » passiveeer, passioneer, passiverer, passiverwerb
passively » massively, passive, passivity
passivieren » passivierende, passivierung, passieren
massiven » massive, massively, massiv
passioneer » passionnees, passioniert, passionweek

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: (((passiven OR passively) OR (passivieren OR massiven)) OR (passiveneer OR passioneer)).
• Adding a wildcard symbol may retrieve word variants: (((passiven or passively) or (passivieren or massiven)) or (passiveneer or passioneer))*.