Perhaps you should try some spelling variations:
"support flood irrigation schemes." » "support flood irrigation scheme.", "support flood irrigation systems.", "support flood mitigation schemes.", "support led irrigation schemes.", "support farm irrigation schemes.", "support food irrigation schemes.", "support look irrigation schemes.", "support follow irrigation schemes."
"export trade integration series." » "export trade integration services.", "export trade interaction series.", "export trade integration server.", "export taxes integration series.", "export base integration series.", "export tax integration series."

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

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