Perhaps you should try some spelling variations:
"support build irrigation schemes." » "support build irrigation scheme.", "support build irrigation systems.", "support field irrigation schemes.", "support public irrigation schemes.", "support supply irrigation schemes.", "support big 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."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support build irrigation schemes.") OR ("support syria irrigation schemes."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support build irrigation schemes.\") OR (\"support syria irrigation schemes.\"))".
• Removing quotes may allow a broader search: (( support build irrigation schemes. ) OR ( support syria irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("support build irrigation schemes.") OR ("support syria irrigation schemes."))*.