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 economy series" » "international rice economy series", "international price economy series", "international risk economy series", "international rich economics series", "international rich economies series", "international french economy series", "international cash economy 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 economy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic surveys") OR ("international rich economy series")).
• Removing quotes may allow a broader search: (( international policy economic surveys ) or ( international rich economy series )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic surveys") or ("international rich economy series"))*.