Perhaps you should try some spelling variations:
"supply cost integrationstheorie 2." » "supply der integrationstheorie 2.", "supply eine integrationstheorie 2.", "supply cost integrationstheorie fur.", "supply cost integration theories.", "supply cost interpretationstheorie 2.", "supply costs integrationstheorie 2."
"supply low irrigation system." » "supply low irrigation systems.", "supply low irrigation water.", "supply low irrigation scheme.", "supply led irrigation system.", "supply flood irrigation system.", "supply local irrigation system.", "supply law irrigation system.", "supply crowd irrigation system.", "supply block 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 low irrigation system.") or ("supply cost integrationstheorie 2."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply low irrigation system.") OR ("supply cost integrationstheorie 2.")).
• Removing quotes may allow a broader search: (( supply low irrigation system. ) or ( supply cost integrationstheorie 2. )).
• Adding a wildcard symbol may retrieve word variants: (("supply low irrigation system.") or ("supply cost integrationstheorie 2."))*.