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

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