Perhaps you should try some spelling variations:
immigration policies » immigration policy, migration policy
integration efforts » international efforts, conservation efforts
race immigration » scale immigration, mass immigration, gross immigration
how integration » power integration, tool integration, _ integration
supply race » supply reach, supply case, supply role
supply how » supply shock

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply how integration efforts. ) or ( supply race immigration policies. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply how integration efforts. ) OR ( supply race immigration policies. )).
• Adding a wildcard symbol may retrieve word variants: (( supply how integration efforts. ) or ( supply race immigration policies. ))*.