Perhaps you should try some spelling variations:
"world economic and financial service." » "world economic and financial services.", "world economy and financial service."
"world economic and financial series." » "world economic and financial services.", "world economic and financial studies.", "world economic and financial stress.", "world economy and financial series."
"world economic and financial system." » "world economic and financial sector.", "world economy and financial system."

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 system.") or ((("world economic and financial series.") OR ("world economic and financial service."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("world economic and financial system.") OR ((("world economic and financial series.") OR ("world economic and financial service.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world economic and financial system.\") or (((\"world economic and financial series.\") OR (\"world economic and financial service.\"))))".
• Removing quotes may allow a broader search: (( world economic and financial system. ) or ((( world economic and financial series. ) OR ( world economic and financial service. )))).
• Adding a wildcard symbol may retrieve word variants: (("world economic and financial system.") or ((("world economic and financial series.") OR ("world economic and financial service."))))*.