Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveer » passiveeer, passiveneer, passivereer, passiver, passiviert, passive
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiv » massive
massiven » massiveen, massive, passiven, massively

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 massiv) OR (passiveer OR passiverer)) OR massiven).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or massiv) or (passiveer OR passiverer)) or massiven)".
• Adding a wildcard symbol may retrieve word variants: (((passiv or massiv) or (passiveer OR passiverer)) or massiven)*.