Perhaps you should try some spelling variations:
"international policy economic studies" » "international poverty economic studies", "international prices economic studies", "national policy economic studies", "international policy economic status", "international policy economic surveys"
"international policy economy series" » "international poverty economy series", "international prices economy series", "national policy economy series", "international policy autonomy series", "international poppy economy series", "international political economy 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 economic studies") or ("international policy economy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic studies") OR ("international policy economy series")).
• Removing quotes may allow a broader search: (( international policy economic studies ) or ( international policy economy series )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic studies") or ("international policy economy series"))*.