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

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