Perhaps you should try some spelling variations:
"international urban economic series" » "international bank economic series", "international union economic series", "international journal economic series", "international urban economics series", "international urban economic services", "international urban economic theories", "international urban economies series", "international urban economy series"
"international business economy series" » "international business entry series", "international business economics series"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international business economy series") OR ("international urban economic series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international business economy series\") OR (\"international urban economic series\"))".
• Removing quotes may allow a broader search: (( international business economy series ) OR ( international urban economic series )).
• Adding a wildcard symbol may retrieve word variants: (("international business economy series") OR ("international urban economic series"))*.