Perhaps you should try some spelling variations:
"support data integration theories." » "support data integration theory.", "support data integration through.", "support data integration efforts.", "support trade integration theories.", "support _ integration theories.", "support data integrity theories.", "import data integration theories.", "support a integration theories.", "export data integration theories."
"support migrant integration schemes." » "support market integration schemes.", "support migrant irrigation schemes.", "support migrant integration some.", "support grant integration schemes."

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

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