Perhaps you should try some spelling variations:
"world economic and financial sectors." » "world economic and financial sector.", "world economic and financial support.", "world economic and financial history."
"world economy and financial systems." » "world economy and financial statements.", "world economy and financial sectors."
"world economic and financial system." » "world economic and financial sector."
"world economic and financial services." » "world economic and financial 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: (((("world economic and financial services.") or ((("world economic and financial sectors.") or ("world economy and financial systems."))))) or ("world economic and financial system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world economic and financial services.") OR ((("world economic and financial sectors.") OR ("world economy and financial systems."))))) OR ("world economic and financial system.")).
• Removing quotes may allow a broader search: (((( world economic and financial services. ) or ((( world economic and financial sectors. ) or ( world economy and financial systems. ))))) or ( world economic and financial system. )).
• Adding a wildcard symbol may retrieve word variants: (((("world economic and financial services.") or ((("world economic and financial sectors.") or ("world economy and financial systems."))))) or ("world economic and financial system."))*.