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

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

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