Perhaps you should try some spelling variations:
"supply side interpretationstheorie 2." » "supply eine integrationstheorie 2.", "supply side integrationstheorie 2.", "supply side interpretation series."
"supply cost integrating policies." » "supply cost integration policies.", "supply cost integrated policies.", "supply cost integrating positive.", "supply count integrating policies.", "supply congo integrating policies.", "supply cc6 integrating policies.", "supply costs integrating policies."

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: (("supply cost integrating policies.") OR ("supply side interpretationstheorie 2."))~.
• Removing quotes may allow a broader search: (( supply cost integrating policies. ) or ( supply side interpretationstheorie 2. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply cost integrating policies.") or ("supply side interpretationstheorie 2."))*.