Perhaps you should try some spelling variations:
"world economic and financial systems." » "world economic and financial system.", "world economic and financial statements."
"world economy and financial assets." » "world economy and financial markets.", "world economy and financial crises."
"world economy and financial services." » "world economy and financial series."

Try widening your search to All Fields.

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