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