Perhaps you should try some spelling variations:
"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."
"support trade banking services." » "export trade banking services.", "support grant banking services.", "import trade banking services.", "support state banking services.", "support free banking services.", "support time banking services.", "support trade banking series."

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 banking services.") or ("support trade integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support trade banking services.") OR ("support trade integration theories.")).
• Removing quotes may allow a broader search: (( support trade banking services. ) or ( support trade integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("support trade banking services.") or ("support trade integration theories."))*.