Perhaps you should try some spelling variations:
"international political economic series" » "international policy economic series", "international ecological economics series", "international political economics series", "international political economic services", "international political economy series"
"International political economy theories" » "International political economic theories", "International political economics theories", "International political economy 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 political economic series") OR ("International political economy theories"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international political economic series\") OR (\"International political economy theories\"))*".
• Removing quotes may allow a broader search: (( international political economic series ) OR ( International political economy theories ))*.