Perhaps you should try some spelling variations:
"supply grain irrigation scheme." » "supply grain irrigation systems.", "supply gray irrigation scheme.", "supply gravity irrigation scheme.", "supply drip irrigation scheme.", "supply chain irrigation scheme.", "supply main irrigation scheme.", "supply ukraine irrigation scheme."
"supply bat conservation efforts." » "supply et conservation efforts.", "supply la conservation efforts.", "supply plant conservation efforts.", "supply data conservation efforts.", "supply a conservation efforts.", "supply gap conservation efforts."

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

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