Perhaps you should try some spelling variations:
"national political economic series" » "national politics economic series", "regional political economic series", "international political economic series", "national political economy series", "national policy economic series", "national ecological economics series", "national political economics series", "national political economic services"
"international prices autonomy series" » "international driven autonomy series", "international provider autonomy series", "international private autonomy series", "international prices astronomy series", "international prices economy series", "international prices autonomy states"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("national political economic series") or ("international prices autonomy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("national political economic series") OR ("international prices autonomy series")).
• Removing quotes may allow a broader search: (( national political economic series ) or ( international prices autonomy series )).
• Adding a wildcard symbol may retrieve word variants: (("national political economic series") or ("international prices autonomy series"))*.