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