Perhaps you should try some spelling variations:
"supply a integration theories." » "supply a integration theorems.", "supply a integrationstheorie 2.", "supply a integration theory.", "supply 3 integration theories.", "supply 2 integration theories.", "supply 4 integration theories.", "supply _ integration theories."
"supply grid irrigation schemes." » "supply grid irrigation scheme.", "supply grid irrigation systems.", "supply grain irrigation schemes.", "supply drip irrigation schemes.", "supply gray irrigation schemes.", "supply crowd irrigation schemes.", "supply great irrigation schemes.", "support grid irrigation schemes."

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