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

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 services."))) or ((("world economic and financial crisis.") or ("world economic and financial crises."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world economic and financial system.") OR ("world economic and financial services."))) OR ((("world economic and financial crisis.") OR ("world economic and financial crises.")))).
• Removing quotes may allow a broader search: (((( world economic and financial system. ) or ( world economic and financial services. ))) or ((( world economic and financial crisis. ) or ( world economic and financial crises. )))).
• Adding a wildcard symbol may retrieve word variants: (((("world economic and financial system.") or ("world economic and financial services."))) or ((("world economic and financial crisis.") or ("world economic and financial crises."))))*.