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 political autonomy series" » "international political economy series", "international political authority series", "international political astronomy series", "international political autonomy states"

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 political autonomy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic surveys") OR ("international political autonomy series")).
• Removing quotes may allow a broader search: (( international policy economic surveys ) or ( international political autonomy series )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic surveys") or ("international political autonomy series"))*.