Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivene » passiveene, passivenene, passiverene, passiven, passiveand, passive
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiv » massive

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