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