Perhaps you should try some spelling variations:
"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."
"supply grid immigration policies." » "supply grid immigration policy.", "supply grid migration policy.", "supply gross immigration policies.", "supply from immigration policies.", "supply und immigration policies.", "supply crowd immigration policies.", "supply great immigration policies.", "support grid immigration policies."

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: (("supply grid integration theories.") OR ("supply grid immigration policies."))~.
• Removing quotes may allow a broader search: (( supply grid integration theories. ) or ( supply grid immigration policies. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration theories.") or ("supply grid immigration policies."))*.