Perhaps you should try some spelling variations:
"World economic and financial studies." » "World economic and financial services."
"World economic and financial series." » "World economic and financial services.", "World economic and financial service.", "World economic and financial surveys."
world economic » world economy

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 series.") OR ("World economic and financial studies."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"World economic and financial series.\") OR (\"World economic and financial studies.\"))".
• Removing quotes may allow a broader search: (( World economic and financial series. ) OR ( World economic and financial studies. )).
• Adding a wildcard symbol may retrieve word variants: (("World economic and financial series.") OR ("World economic and financial studies."))*.