Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivere » massivere, passivenere, passiverere, passiverer, passiver
aktivierende » aktivierenden, aktivieren, motivierende

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 aktivierende) OR (massive OR passive)) OR passivere)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or aktivierende) or (massive OR passive)) or passivere)*".