Perhaps you should try some spelling variations:
"world economic and financial sectors." » "world economic and financial sector.", "world economic and financial support.", "world economic and financial history."
"world economic and financial systems." » "world economic and financial statements.", "world economic and financial sectors."
"world economic and financial system." » "world economic and financial sector."
"world economy and financial system." » "world economy and financial sector."

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 sectors."))) or ((("world economic and financial system.") or ("world economy and financial system."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world economic and financial systems.") OR ("world economic and financial sectors."))) OR ((("world economic and financial system.") OR ("world economy and financial system."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world economic and financial systems.\") OR (\"world economic and financial sectors.\"))) or (((\"world economic and financial system.\") or (\"world economy and financial system.\"))))*".
• Removing quotes may allow a broader search: (((( world economic and financial systems. ) OR ( world economic and financial sectors. ))) or ((( world economic and financial system. ) or ( world economy and financial system. ))))*.