Perhaps you should try some spelling variations:
"support policy international theories." » "support policy international treaties.", "support policy international series.", "support policy international fisheries.", "support policy interventions theories.", "support policy intervention theories.", "support policies international theories.", "import policy international theories."
"support syria irrigation schemes." » "support syria irrigation scheme.", "support syria irrigation systems.", "support africa irrigation schemes.", "support drip irrigation schemes.", "support surge irrigation schemes.", "support social irrigation schemes.", "support agri 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 syria irrigation schemes.") OR ("support policy international theories."))~.
• Removing quotes may allow a broader search: (( support syria irrigation schemes. ) or ( support policy international theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support syria irrigation schemes.") or ("support policy international theories."))*.