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 africa irrigation schemes." » "support africa irrigation scheme.", "support africa irrigation systems.", "support africa immigration schemes.", "support syria irrigation schemes.", "support drip irrigation schemes.", "supporting africa irrigation schemes.", "supply africa irrigation schemes.", "support price 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 build irrigation schemes.") or ("support africa irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support build irrigation schemes.") OR ("support africa irrigation schemes.")).
• Removing quotes may allow a broader search: (( support build irrigation schemes. ) or ( support africa irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("support build irrigation schemes.") or ("support africa irrigation schemes."))*.