Perhaps you should try some spelling variations:
"international political technologies series" » "international policy technologies series", "international politics technologies series", "international political technological series", "international critical technologies series", "international political technology series"
"international energy economic systems" » "international energy economic sectors", "international energy economic status", "international energy economics systems", "international energy economy systems", "international ecology economic systems"

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: (("international political technologies series") or ("international energy economic systems"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political technologies series") OR ("international energy economic systems")).
• Removing quotes may allow a broader search: (( international political technologies series ) or ( international energy economic systems )).
• Adding a wildcard symbol may retrieve word variants: (("international political technologies series") or ("international energy economic systems"))*.