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

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