Perhaps you should try some spelling variations:
immigration policies » immigration policy, migration policy
integration efforts » international efforts, conservation efforts
global integration » regional integration
grid immigration » gross immigration, grid integration, from immigration
support grid » support agri, support grant, support group

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

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