Perhaps you should try some spelling variations:
"support grid integration theories." » "support grid integration theorems.", "support grid integrationstheorie 2.", "support grid integration theory.", "support agri integration theories.", "support grant integration theories.", "support group integration theories."
"supply syria irrigation schemes." » "supply syria irrigation scheme.", "supply syria irrigation systems.", "supply africa irrigation schemes.", "supply drip irrigation schemes.", "supply surge irrigation schemes.", "supply social irrigation schemes.", "supply sierra 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: (("support grid integration theories.") OR ("supply syria irrigation schemes."))~.
• Removing quotes may allow a broader search: (( support grid integration theories. ) or ( supply syria irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grid integration theories.") or ("supply syria irrigation schemes."))*.