Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiv » massive
massivere » massiveere, massiver, massive, 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 (passiverer OR massivere)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv OR massiv) or (passiverer or massivere))".
• Adding a wildcard symbol may retrieve word variants: ((passiv OR massiv) or (passiverer or massivere))*.