Perhaps you should try some spelling variations:
"international political economics series" » "international policy economics series", "international political economic series", "international political economies series", "international political economy series", "international political economic studies"
"international prices economic theories" » "international best economic theories", "international banks economic theories", "international prices economic theory", "international crisis economic theories", "international brief economic theories", "international africa's economic theories"

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