Perhaps you should try some spelling variations:
"support migrant integration schemes." » "support market integration schemes.", "support migrant integration schengen.", "support migrant irrigation schemes.", "support migrant integration regimes.", "support migrants integration schemes.", "support grant integration schemes.", "supporting migrants integration schemes."
"import data integrity theories." » "import data integrity series.", "import data integrity stories.", "import data integration theories.", "import duty integrity theories."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("import data integrity theories.") or ("support migrant integration schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import data integrity theories.") OR ("support migrant integration schemes.")).
• Removing quotes may allow a broader search: (( import data integrity theories. ) or ( support migrant integration schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("import data integrity theories.") or ("support migrant integration schemes."))*.