Perhaps you should try some spelling variations:
"international political economic series" » "international policy economic series", "international political economy series", "international ecological economics series", "international political economic services", "international political economic theories", "international political economic surveys"
"International political economic survey" » "International political economy survey", "International policy economic survey", "International ecological economics survey", "International political economic surveys", "International political economic security", "International political economic studies"

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

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