Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierender » passiveierender, massivierender, passivenierender, passivierende, aktivierender, passivierendeder, passivierungder, passierender
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren

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