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