Perhaps you should try some spelling variations:
based interaction » based interactive, based instruction, based interventions
interaction der » interaction term, interaction dead, interactions under
der studien » der studie, der studenten, order studies
cases case » causes case, crises case, cases based
case case » case based, use case
base case » use case, base wage

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: commercial ((cases case) OR (((case case) OR (base case)))) based interaction der studien.~.
• Adding a wildcard symbol may retrieve word variants: commercial ((cases case) or (((case case) or (base case)))) based interaction der studien.*.