Perhaps you should try some spelling variations:
"support supply irrigation schemes." » "support supply irrigation scheme.", "support supply irrigation systems.", "support supply irrigated schemes.", "support supply integration schemes.", "support supply sanitation schemes.", "supporting supply irrigation schemes.", "export supply irrigation schemes.", "short supply irrigation schemes."
"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."

Try widening your search to All Fields.

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

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