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 change irrigation scheme." » "supply change mitigation scheme.", "supply canal irrigation scheme.", "supply large irrigation scheme.", "supply change irrigation systems.", "supply charges irrigation scheme.", "supply channels irrigation scheme.", "supply chain's irrigation scheme."

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 trade integrationstheorie 2.") OR ("supply change irrigation scheme."))~.
• Removing quotes may allow a broader search: (( supply trade integrationstheorie 2. ) or ( supply change irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply trade integrationstheorie 2.") or ("supply change irrigation scheme."))*.