Perhaps you should try some spelling variations:
"international policy economic surveys" » "international poverty economic surveys", "international prices economic surveys", "national policy economic surveys", "international policy economic studies", "international policy economic systems"
"international rich economies series" » "international rice economies series", "international price economies series", "international risk economies series", "international rich economics series", "international rich economic series", "international rich economy series", "international city economies series", "international african economies series", "international growth economies 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 surveys") or ("international rich economies series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic surveys") OR ("international rich economies series")).
• Removing quotes may allow a broader search: (( international policy economic surveys ) or ( international rich economies series )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic surveys") or ("international rich economies series"))*.