Perhaps you should try some spelling variations:
"world economic and financial systems." » "world economic and financial statements.", "world economic and financial sectors.", "world economy and financial systems."
"world economic and financial stress." » "world economic and financial distress.", "world economic and financial access.", "world economic and financial strength.", "world economy and financial stress."
"world economic and financial system." » "world economic and financial sector.", "world economy and financial system."
"world economic and financial burden." » "world economy and financial burden."

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