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 water sanitation schemes." » "support water sanitation systems.", "support water sanitation access.", "support water irrigation schemes.", "support basic sanitation schemes.", "support chapter sanitation schemes.", "support greater sanitation schemes.", "support better sanitation 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 water sanitation schemes.") OR ("support policy integration theories."))~.
• Removing quotes may allow a broader search: (( support water sanitation schemes. ) or ( support policy integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support water sanitation schemes.") or ("support policy integration theories."))*.