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."
"support trade integration series." » "support trade integration services.", "support trade interaction series.", "support trade integration server.", "support trainer integration series.", "export trade integration series.", "import trade integration series."

Try widening your search to All Fields.

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