Perhaps you should try some spelling variations:
"international political technologies services" » "international policy technologies services", "international politics technologies services", "international political technological services", "international critical technologies services", "international political technologies series", "international political technology services"
"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 services") or ("international energy economic systems"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political technologies services") OR ("international energy economic systems")).
• Removing quotes may allow a broader search: (( international political technologies services ) or ( international energy economic systems )).
• Adding a wildcard symbol may retrieve word variants: (("international political technologies services") or ("international energy economic systems"))*.