Perhaps you should try some spelling variations:
"world economic and financial systems." » "world economic and financial system.", "world economic and financial statements."
"world economy and financial stress." » "world economy and financial access.", "world economy and financial studies.", "world economy and financial assets."
"world economy and financial strength." » "world economy and financial strengths.", "world economy and financial strengthen."

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 systems.") or ((((("world economy and financial stress.") or ("world economy and financial distress."))) or ("world economy and financial strength."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("world economic and financial systems.") OR ((((("world economy and financial stress.") OR ("world economy and financial distress."))) OR ("world economy and financial strength.")))).
• Removing quotes may allow a broader search: (( world economic and financial systems. ) or ((((( world economy and financial stress. ) or ( world economy and financial distress. ))) or ( world economy and financial strength. )))).
• Adding a wildcard symbol may retrieve word variants: (("world economic and financial systems.") or ((((("world economy and financial stress.") or ("world economy and financial distress."))) or ("world economy and financial strength."))))*.