Perhaps you should try some spelling variations:
"support policy integration theories." » "support policy integration theorems.", "support policy integrationstheorie 2.", "support policy integration theory.", "support political integration theories.", "support policy international theories.", "support policy intervention theories.", "support policies integration theories.", "import policy integration 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 integration theories."))~.
• Removing quotes may allow a broader search: (( support syria irrigation schemes. ) or ( support policy integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support syria irrigation schemes.") or ("support policy integration theories."))*.