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 economic and financial services." » "world economic and financial series."
"world economy and financial services." » "world economy and financial series."

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 economy 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 economy and financial services."))))) OR ("world economic and financial crisis.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"world economic and financial burden.\") or (\"world economic and financial stress.\"))) or (((\"world economic and financial services.\") OR (\"world economy 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 economy 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 economy and financial services."))))) or ("world economic and financial crisis."))*.