Perhaps you should try some spelling variations:
"support strategic interactions series." » "support strategic directions series.", "support strategic information series.", "support strategic interaction terms.", "support strategic interactions between.", "support strategy interactions series.", "sector strategic interactions series.", "effort strategic interactions series."
"support trade integration theories." » "support trade integration theory.", "support trade integration through.", "support trade integration efforts.", "export trade integration theories.", "support grant integration theories.", "import trade integration theories."

Try widening your search to All Fields.

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

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