Perhaps you should try some spelling variations:
"export trade integration theory." » "export trade integration through.", "export trade information theory.", "export trade innovation theory.", "export taxes integration theory.", "export base integration theory.", "export tax integration theory."
"support ukraine innovation through." » "support ukraine information through.", "support ukraine invasion through.", "support sustained innovation through.", "supply ukraine innovation through.", "support trainer innovation through."

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

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