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 tool irrigation schemes." » "supply tool irrigation scheme.", "supply tool irrigation systems.", "supply total irrigation schemes.", "supply flood irrigation schemes.", "supply local irrigation schemes.", "supply school irrigation schemes.", "support tool irrigation schemes.", "supply donor irrigation schemes."

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

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