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 surveys." » "world economy and financial stress.", "world economy and financial services.", "world economy and financial systems."
"world economic and financial series." » "world economic and financial services.", "world economic and financial service.", "world economic and financial studies."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("world economy and financial surveys.") or ("world economic and financial series."))) or ("world economic and financial strengthen."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world economy and financial surveys.") OR ("world economic and financial series."))) OR ("world economic and financial strengthen.")).
• Removing quotes may allow a broader search: (((( world economy and financial surveys. ) or ( world economic and financial series. ))) or ( world economic and financial strengthen. )).
• Adding a wildcard symbol may retrieve word variants: (((("world economy and financial surveys.") or ("world economic and financial series."))) or ("world economic and financial strengthen."))*.