Perhaps you should try some spelling variations:
"supply national immigration policies." » "supply national immigration policy.", "supply national migration policy.", "supply national integration policies.", "supply national irrigation policies.", "supply national immunization policies.", "support national immigration policies.", "supply international immigration policies."
"supply grid integration theories." » "supply grid integration theorems.", "supply grid integrationstheorie 2.", "supply grid integration theory.", "supply crowd integration theories.", "supply great integration theories.", "support grid integration theories."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply national immigration policies.") or ("supply grid integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply national immigration policies.") OR ("supply grid integration theories."))*.
• Removing quotes may allow a broader search: (( supply national immigration policies. ) or ( supply grid integration theories. ))*.