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

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 series") OR ("international policy economic surveys"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international policy economic series\") OR (\"international policy economic surveys\"))".
• Removing quotes may allow a broader search: (( international policy economic series ) OR ( international policy economic surveys )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic series") OR ("international policy economic surveys"))*.