Perhaps you should try some spelling variations:
"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 burden." » "world economy and financial burden."
"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."

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 services."))) or ("world economic and financial crisis."))~.
• 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 services."))) OR ("world economic and financial crisis.")).
• Removing quotes may allow a broader search: (((((( world economic and financial burden. ) or ( world economic and financial stress. ))) or ( world economic and financial services. ))) or ( world economic and financial crisis. )).
• Adding a wildcard symbol may retrieve word variants: (((((("world economic and financial burden.") or ("world economic and financial stress."))) or ("world economic and financial services."))) or ("world economic and financial crisis."))*.