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 grid integration theories.", "support urban integration theories."
"support trade integration series." » "support trade integrating services.", "support trade integration schemes.", "support trade integration social.", "export trade integration series.", "import trade integration series.", "support price integration series."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("support grant integration theories.") or ("support trade integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support grant integration theories.") OR ("support trade integration series.")).
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