Perhaps you should try some spelling variations:
"world economy and financial systems." » "world economy and financial system.", "world economy and financial statements."
"world economy and financial stress." » "world economy and financial distress.", "world economy and financial access.", "world economy and financial strength."
"world economic and financial series." » "world economic and financial services.", "world economic and financial service.", "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 systems.") or ("world economy and financial stress."))) or ("world economic and financial series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world economy and financial systems.") OR ("world economy and financial stress."))) OR ("world economic and financial series.")).
• Removing quotes may allow a broader search: (((( world economy and financial systems. ) or ( world economy and financial stress. ))) or ( world economic and financial series. )).
• Adding a wildcard symbol may retrieve word variants: (((("world economy and financial systems.") or ("world economy and financial stress."))) or ("world economic and financial series."))*.