Perhaps you should try some spelling variations:
"import duty integration efforts." » "import duty international efforts.", "import duty conservation efforts.", "import dutch integration efforts.", "import data integration efforts.", "import why integration efforts.", "import duties integration efforts."
"support grid irrigation schemes." » "support grid irrigation scheme.", "support grid irrigation systems.", "support grain irrigation schemes.", "support drip irrigation schemes.", "support gray irrigation schemes.", "support agri irrigation schemes.", "support grant irrigation schemes.", "support group 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 grid irrigation schemes.") OR ("import duty integration efforts."))~.
• Removing quotes may allow a broader search: (( support grid irrigation schemes. ) or ( import duty integration efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grid irrigation schemes.") or ("import duty integration efforts."))*.