Perhaps you should try some spelling variations:
"support grant integration theories." » "support grant integration theorems.", "support grant integrationstheorie 2.", "support grant integration theory.", "support migrant integration theories.", "support migrants integration theories.", "support statt integration theories."
"supply border migration schemes." » "supply border integration schemes.", "supply border segregation schemes.", "supply border irrigation schemes.", "supply worker migration schemes.", "supply der migration schemes.", "supply order migration schemes.", "supply under migration 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 grant integration theories.") or ("supply border migration schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support grant integration theories.") OR ("supply border migration schemes.")).
• Removing quotes may allow a broader search: (( support grant integration theories. ) or ( supply border migration schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("support grant integration theories.") or ("supply border migration schemes."))*.