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

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