Perhaps you should try some spelling variations:
"world economic and financial service." » "world economic and financial services."
"world economic and financial stress." » "world economic and financial access.", "world economic and financial systems.", "world economic and financial studies."
"world economic and financial series." » "world economic and financial services.", "world economic and financial studies.", "world economic and financial systems."

You may be able to get more results by adjusting your search query.

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