Perhaps you should try some spelling variations:
"supply cost integration theories." » "supply cost integration theorems.", "supply cost integrationstheorie 2.", "supply cost integration theory.", "supply post integration theories.", "supply test integration theories.", "supply about integration theories.", "supply costs integration theories."
"supply grid irrigation scheme." » "supply grid irrigation systems.", "supply grain irrigation scheme.", "supply drip irrigation scheme.", "supply gray irrigation scheme.", "supply crowd irrigation scheme.", "supply great irrigation scheme.", "support grid 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 cost integration theories.") OR ("supply grid irrigation scheme."))~.
• Removing quotes may allow a broader search: (( supply cost integration theories. ) or ( supply grid irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply cost integration theories.") or ("supply grid irrigation scheme."))*.