Perhaps you should try some spelling variations:
immigration policies » immigration policy, migration policy
integration efforts » international efforts, conservation efforts
chain immigration » chain migration, chain integration, chinese immigration
crowd integration » grid integration, rfid integration, beyond integration
supply crowd » supply growth, supply cost, supply from

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

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