Perhaps you should try some spelling variations:
"supply chain integrationstheorie 2." » "supply eine integrationstheorie 2.", "supply der integrationstheorie 2.", "supply chain integrationstheorie fur.", "supply chain integration theories.", "supply chain interpretationstheorie 2."
"supply side international policy." » "supply side international poverty.", "supply side international prices.", "supply side national policy.", "supply some international policy.", "supply time international policy.", "supply eine international policy."

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 chain integrationstheorie 2.") OR ("supply side international policy."))~.
• Removing quotes may allow a broader search: (( supply chain integrationstheorie 2. ) or ( supply side international policy. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply chain integrationstheorie 2.") or ("supply side international policy."))*.