Perhaps you should try some spelling variations:
"international services economic series" » "international service economic series", "international series economic series", "international prices economic series", "international service economy series", "international services economics series", "international services economic services", "international services economy series"
"international policy economic studies" » "international poverty economic studies", "international prices economic studies", "national policy economic studies", "international policy economic status"

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