Perhaps you should try some spelling variations:
"support grid irrigation schemes." » "support grid irrigation scheme.", "support grid irrigation systems.", "support drip irrigation schemes.", "support syria irrigation schemes.", "support crop irrigation schemes.", "support agri irrigation schemes.", "support grant irrigation schemes.", "support group irrigation schemes."
"supply how integrated surveys." » "supply how integrated services.", "supply how integrated systems.", "supply how integrated markets.", "supply _ integrated surveys.", "supply 1 integrated surveys.", "supply 3 integrated surveys.", "supply shock integrated surveys."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply how integrated surveys.") or ("support grid irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply how integrated surveys.") OR ("support grid irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply how integrated surveys. ) or ( support grid irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply how integrated surveys.") or ("support grid irrigation schemes."))*.