Perhaps you should try some spelling variations:
immigration policies » immigration policy, migration policy
integration theories » integration theorems, integrationstheorie 2, integration theory
now immigration » new immigration, net immigration, anti immigration
how integration » new integration, how interaction, die integration
supply now » supply crowd, supply donor

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply now immigration policies. ) OR ( supply how integration theories. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply now immigration policies. ) OR ( supply how integration theories. ))*.