Perhaps you should try some spelling variations:
"support water irrigation schemes." » "support water irrigation scheme.", "support water irrigation systems.", "support scale irrigation schemes.", "support canal irrigation schemes.", "support farm irrigation schemes.", "support chapter irrigation schemes.", "support greater irrigation schemes.", "support better irrigation schemes."
"supply social integration series." » "supply global integration series.", "supply financial integration series.", "supply regional integration series.", "supply social integration services.", "supply social interaction series.", "supply social integration server."

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

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