Perhaps you should try some spelling variations:
"support syria irrigation schemes." » "support syria irrigation scheme.", "support syria irrigation systems.", "support africa irrigation schemes.", "support drip irrigation schemes.", "support surge irrigation schemes.", "support social irrigation schemes.", "support agri irrigation schemes."
"supply grid information theory." » "supply good information theory.", "supply guided information theory.", "supply rapid information theory.", "supply crowd information theory.", "supply great information theory.", "support grid information theory."

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