Perhaps you should try some spelling variations:
"supply grid integration theories." » "supply grid integration theory.", "supply grid integration through.", "supply grid integration efforts.", "supply _ integration theories.", "supply data integration theories.", "supply crowd integration theories.", "support grid integration theories."
"import trade integration report." » "import trade integration efforts.", "import trade innovation report.", "import trade integration theory.", "export trade integration report.", "import price integration report.", "import taxes integration report."

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: (("supply grid integration theories.") OR ("import trade integration report."))~.
• Removing quotes may allow a broader search: (( supply grid integration theories. ) or ( import trade integration report. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration theories.") or ("import trade integration report."))*.