Perhaps you should try some spelling variations:
"support policy integration efforts." » "support policy international efforts.", "support policy conservation efforts.", "support political integration efforts.", "support policy intervention efforts.", "support policies integration efforts.", "import policy integration efforts."
"support canal irrigation schemes." » "support canal irrigation scheme.", "support canal irrigation systems.", "support scale irrigation schemes.", "support can irrigation schemes.", "support data irrigation schemes.", "support bank irrigation schemes."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("support canal irrigation schemes.") OR ("support policy integration efforts."))~.
• Removing quotes may allow a broader search: (( support canal irrigation schemes. ) or ( support policy integration efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support canal irrigation schemes.") or ("support policy integration efforts."))*.