Perhaps you should try some spelling variations:
"world economic and financial strengthen." » "world economic and financial strength.", "world economic and financial stresses.", "world economy and financial strengthen."
"world economic and financial stress." » "world economic and financial distress.", "world economic and financial access.", "world economic and financial strength.", "world economy and financial stress."
"world economic and financial system." » "world economic and financial sector.", "world economy and financial system."

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