Perhaps you should try some spelling variations:
"support grant integration theories." » "support grant integration theory.", "support grant integration through.", "support grant integration efforts.", "support migrant integration theories.", "support trade integration theories.", "support grid integration theories."
"supply scale immigration policy." » "supply scale migration policy.", "supply scale irrigation policy.", "supply race immigration policy.", "supply case immigration policy.", "supply scheme immigration policy.", "supply social immigration policy."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply scale immigration policy.") or ("support grant integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply scale immigration policy.") OR ("support grant integration theories."))*.
• Removing quotes may allow a broader search: (( supply scale immigration policy. ) or ( support grant integration theories. ))*.