Perhaps you should try some spelling variations:
"export chain integration theories." » "export chain integration theory.", "export chain integration through.", "export chain integration efforts.", "export data integration theories.", "export grid integration theories.", "export channel integration theories.", "export share integration theories.", "export plan integration theories."
"support trade integration schemes." » "support trade irrigation schemes.", "support trade integration some.", "export trade integration schemes.", "support grant integration schemes.", "import trade integration schemes."

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