Perhaps you should try some spelling variations:
"international policy economy series" » "international poverty economy series", "international prices economy series", "national policy economy series", "international policy economic series", "international polish economy series", "international politics economy series", "international policy economics series"
"international economics economic theories" » "international economics econometric theories", "international economics economic theory", "international economics economics series"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international economics economic theories") or ("international policy economy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international economics economic theories") OR ("international policy economy series"))*.
• Removing quotes may allow a broader search: (( international economics economic theories ) or ( international policy economy series ))*.