Perhaps you should try some spelling variations:
"supply trade integrationstheorie 2." » "supply der integrationstheorie 2.", "supply eine integrationstheorie 2.", "supply traditionelle integrationstheorie 2.", "supply trade integrationstheorie fur.", "supply trade integration theories.", "supply trade interpretationstheorie 2.", "supply case integrationstheorie 2."
"supply grid lending services." » "supply grid nonlending services.", "supply grid planning services.", "supply grid banking services.", "supply grid testing services.", "supply crowd lending services.", "supply great lending services.", "support grid lending services."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply trade integrationstheorie 2.") or ("supply grid lending services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integrationstheorie 2.") OR ("supply grid lending services.")).
• Removing quotes may allow a broader search: (( supply trade integrationstheorie 2. ) or ( supply grid lending services. )).
• Adding a wildcard symbol may retrieve word variants: (("supply trade integrationstheorie 2.") or ("supply grid lending services."))*.