Perhaps you should try some spelling variations:
"world economic and financial systems." » "world economic and financial statements."
"world economy and financial systems." » "world economy and financial statements."
"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 systems.") OR ("world economy and financial systems."))) or ("world economic and financial sector."))))) 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 systems.") OR ("world economy and financial systems."))) OR ("world economic and financial sector."))))) OR ("world economic and financial system.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world economic and financial services.\") or (((((\"world economic and financial systems.\") OR (\"world economy and financial systems.\"))) or (\"world economic and financial sector.\"))))) or (\"world economic and financial system.\"))".
• Removing quotes may allow a broader search: (((( world economic and financial services. ) or ((((( world economic and financial systems. ) OR ( world economy and financial systems. ))) or ( world economic and financial sector. ))))) or ( world economic and financial system. )).
• Adding a wildcard symbol may retrieve word variants: (((("world economic and financial services.") or ((((("world economic and financial systems.") OR ("world economy and financial systems."))) or ("world economic and financial sector."))))) or ("world economic and financial system."))*.