Perhaps you should try some spelling variations:
"supply grid integrationstheorie 2." » "supply der integrationstheorie 2.", "supply eine integrationstheorie 2.", "supply grid integrationstheorie fur.", "supply grid integration theories.", "supply grid interpretationstheorie 2.", "supply crowd integrationstheorie 2.", "supply great integrationstheorie 2.", "support grid integrationstheorie 2."
"supply chain irrigation system." » "supply chain irrigation systems.", "supply chain irrigation water.", "supply chain irrigation scheme.", "supply grain irrigation system.", "supply change irrigation system.", "supply basin irrigation system."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply grid integrationstheorie 2.") or ("supply chain irrigation system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply grid integrationstheorie 2.") OR ("supply chain irrigation system."))*.
• Removing quotes may allow a broader search: (( supply grid integrationstheorie 2. ) or ( supply chain irrigation system. ))*.