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

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 political economic services"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"International political economic studies\") OR (\"international political economic services\"))".
• Removing quotes may allow a broader search: (( International political economic studies ) OR ( international political economic services )).
• Adding a wildcard symbol may retrieve word variants: (("International political economic studies") OR ("international political economic services"))*.