Perhaps you should try some spelling variations:
"supply shifts conservation efforts." » "supply situ conservation efforts.", "supply sites conservation efforts.", "supply skins conservation efforts.", "supply shocks conservation efforts.", "supply sides conservation efforts."
"supply case irrigation schemes." » "supply case irrigation scheme.", "supply case irrigation systems.", "supply scale irrigation schemes.", "supply use irrigation schemes.", "supply change irrigation schemes.", "supply cost irrigation schemes.", "supply chain irrigation schemes.", "supply curve irrigation schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply case irrigation schemes.") or ("supply shifts conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply case irrigation schemes.") OR ("supply shifts conservation efforts."))*.
• Removing quotes may allow a broader search: (( supply case irrigation schemes. ) or ( supply shifts conservation efforts. ))*.