Perhaps you should try some spelling variations:
international ecological » international economics, international economic, international economies
international political » international policy
"International political economic studies" » "International political economy studies", "International policy economic studies", "International political economic status", "International political economic surveys"
"International ecological economics studies" » "International ecological economy studies", "International ecological ecological studies", "International ecological economic study"

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 studies") OR ("International ecological economics studies"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"International political economic studies\") OR (\"International ecological economics studies\"))*".
• Removing quotes may allow a broader search: (( International political economic studies ) OR ( International ecological economics studies ))*.