Perhaps you should try some spelling variations:
"world economic and financial systems." » "world economic and financial statements."
"world economic and financial stress." » "world economic and financial distress.", "world economic and financial access.", "world economic and financial studies."
"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 economic and financial sector."))) OR ("world economic and financial system."))) OR ((("world economic and financial stress.") OR ("world economy and financial strength."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"world economic and financial systems.\") OR (\"world economic and financial sector.\"))) OR (\"world economic and financial system.\"))) OR (((\"world economic and financial stress.\") OR (\"world economy and financial strength.\"))))".
• Removing quotes may allow a broader search: (((((( world economic and financial systems. ) OR ( world economic and financial sector. ))) OR ( world economic and financial system. ))) OR ((( world economic and financial stress. ) OR ( world economy and financial strength. )))).
• Adding a wildcard symbol may retrieve word variants: (((((("world economic and financial systems.") OR ("world economic and financial sector."))) OR ("world economic and financial system."))) OR ((("world economic and financial stress.") OR ("world economy and financial strength."))))*.