Perhaps you should try some spelling variations:
"support policy intervention efforts." » "support policy intersectional efforts.", "support policy prevention efforts.", "support policy integration efforts.", "support policy interventions efforts.", "support policies intervention efforts.", "import policy intervention efforts."
"support data irrigation schemes." » "support data irrigation scheme.", "support data irrigation systems.", "support delta irrigation schemes.", "support canal irrigation schemes.", "support water irrigation schemes.", "support a irrigation schemes.", "support de 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: (("support data irrigation schemes.") or ("support policy intervention efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support data irrigation schemes.") OR ("support policy intervention efforts.")).
• Removing quotes may allow a broader search: (( support data irrigation schemes. ) or ( support policy intervention efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("support data irrigation schemes.") or ("support policy intervention efforts."))*.