Perhaps you should try some spelling variations:
"supply canal irrigation schemes." » "supply canal irrigation scheme.", "supply canal irrigation systems.", "supply scale irrigation schemes.", "supply canada irrigation schemes.", "supply annual irrigation schemes.", "supply china irrigation schemes."
"support gaps regulating services." » "support gas regulation services.", "support ban regulating services.", "support cues regulating services.", "support groups regulating services.", "support grant regulating services.", "support crops regulating services."

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

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