Perhaps you should try some spelling variations:
immigration policies » immigration policy, migration policy
policy integration » policy intervention, social integration, policy interventions
integration series » integration theories, integrating services, integration schemes
grant immigration » anti immigration, gross immigration, race immigration
support policy » support policies, import policy

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

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