Perhaps you should try some spelling variations:
"international panel economies series" » "international paris economies series", "international peace economies series", "international prices economies series", "international panel economics series", "international panel economic series", "international panel economy series", "international planned economies series", "international apec economies series", "international based economies series"
"national policy autonomy series" » "national poverty autonomy series", "national political autonomy series", "national policy astronomy series", "national policy economy series", "national policy autonomy states"

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: (("national policy autonomy series") OR ("international panel economies series"))~.
• Removing quotes may allow a broader search: (( national policy autonomy series ) or ( international panel economies series ))~.
• Adding a wildcard symbol may retrieve word variants: (("national policy autonomy series") or ("international panel economies series"))*.