Perhaps you should try some spelling variations:
international ecological » international technological, international psychological, international economics
international political » international policy
"International political economic services" » "International political economy services", "International policy economic services", "International political economics series", "International political ecological services", "International political economic studies"
"International ecological economics services" » "International ecological economics series", "International ecological economics soviet", "International ecological economics ethics"

Try widening your search to All Fields.

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