Perhaps you should try some spelling variations:
policy intervention » policy interventions
intervention series » interventions series, intervention studies, intervention seitens
integration south » integration study, integration some, integration social
bans integration » means integration, banana integration, urban integration
support policy » support policies, import policy
import bans » import taxes

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( import bans integration south. ) OR ( support policy intervention series. ))~.
• Adding a wildcard symbol may retrieve word variants: (( import bans integration south. ) or ( support policy intervention series. ))*.