Perhaps you should try some spelling variations:
"international policy economic series" » "international poverty economic series", "national policy economic series", "international policy economics series", "international policy economic services", "international policy economy series"
"international prices economic series" » "international prices economics series", "international prices economic services", "international prices economy series", "international crises economic series", "international prices econometric series", "international services economic 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 policy economic series") OR ("international prices economic series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international policy economic series\") OR (\"international prices economic series\"))".
• Removing quotes may allow a broader search: (( international policy economic series ) OR ( international prices economic series )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic series") OR ("international prices economic series"))*.