Perhaps you should try some spelling variations:
"supply grid integration theories." » "supply grid integration theorems.", "supply grid integrationstheorie 2.", "supply grid integration theory.", "supply crowd integration theories.", "supply great integration theories.", "support grid integration theories."
"supply change irrigation schemes." » "supply change irrigation scheme.", "supply change irrigation systems.", "supply change mitigation schemes.", "supply canal irrigation schemes.", "supply large irrigation schemes.", "supply charges irrigation schemes.", "supply channels irrigation schemes.", "supply chain's irrigation schemes."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply grid integration theories.\") OR (\"supply change irrigation schemes.\"))~".
• Removing quotes may allow a broader search: (( supply grid integration theories. ) OR ( supply change irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration theories.") OR ("supply change irrigation schemes."))*.