Perhaps you should try some spelling variations:
migrant integration » market integration
integration schemes » integration schengen, irrigation schemes, integration regimes
interaction series » interactions series, interaction studies, interaction terms
support migrant » support migrants, support grant, supporting migrants

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

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