Perhaps you should try some spelling variations:
"supply grid integration theorems." » "supply grid integration theories.", "supply grid integration theory.", "supply grid integrationstheorie 2.", "supply crowd integration theorems.", "supply great integration theorems.", "support grid integration theorems."
"supply low irrigation systems." » "supply led irrigation systems.", "supply flood irrigation systems.", "supply local irrigation systems.", "supply law irrigation systems.", "supply crowd irrigation systems.", "supply block irrigation systems.", "supply low irrigation system."

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 grid integration theorems.") OR ("supply low irrigation systems."))~.
• Removing quotes may allow a broader search: (( supply grid integration theorems. ) or ( supply low irrigation systems. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration theorems.") or ("supply low irrigation systems."))*.