Perhaps you should try some spelling variations:
"supply trade interaction series." » "supply trade interactions series.", "supply trade interaction studies.", "supply trade interaction terms.", "supply trade integration series.", "supply face interaction series.", "supply time interaction series.", "supply case interaction series."
"supply grid regulating services." » "supply grid regulations services.", "supply grid regulation services.", "supply ii regulating services.", "supply crowd regulating services.", "supply great regulating services.", "support grid regulating services."

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

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