Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierende » passiveierende, massivierende, passivenierende, passivieren, aktivierende, passivierung
passivierender » passiveierender, massivierender, passivenierender, passivierenr, aktivierender, passivierungr, passivieren
massively » 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 massively) OR (passivierende OR passivierender)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massively) or (passivierende OR passivierender))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massively) or (passivierende OR passivierender))*.