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