Perhaps you should try some spelling variations:
integration policies » immigration policies, international policies, migration policies
immigration policy » migration policy
grid integration » trade integration, _ integration, data integration
how immigration » from immigration, does immigration, _ immigration
supply grid » supply crowd, support grid
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 immigration policy. ) or ( supply grid integration policies. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply how immigration policy. ) OR ( supply grid integration policies. )).
• Adding a wildcard symbol may retrieve word variants: (( supply how immigration policy. ) or ( supply grid integration policies. ))*.