Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passively » passiveely, massively, passiverely, passive
passivity » passiveity, massivity, passiverity
passiven » passiveen, massiven, passiveren, passive, passion
passiverer » passiveerer, massiverer, passivererer, passiverwerb, passivieren, passiver
massiven » massive, massively, massiv

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 (passively OR passivity)) OR (passiven OR massiven)) OR passiverer).
• Adding a wildcard symbol may retrieve word variants: (((passiv or (passively or passivity)) or (passiven or massiven)) or passiverer)*.