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 reader astronomy series" » "international gender astronomy series", "international tenders astronomy series", "international trade astronomy series", "international reader autonomy series", "international radio astronomy series", "international greater autonomy series"

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