Perhaps you should try some spelling variations:
medical intervention » american intervention, military intervention, policy intervention
ethical intervention » external intervention, external interventions, american intervention
social intervention » social integration, policy intervention, cia interventions
soviet intervention » policy intervention, foreign intervention

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• Performing a fuzzy search may retrieve terms with similar spellings: (("social interaction --") or ("((((social intervention) or (((medical intervention) OR (ethical intervention))))) or (soviet intervention)) --"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("social interaction --") OR ("((((social intervention) or (((medical intervention) OR (ethical intervention))))) or (soviet intervention)) --")).
• Removing quotes may allow a broader search: (( social interaction -- ) or ( ((((social intervention) or (((medical intervention) OR (ethical intervention))))) or (soviet intervention)) -- )).
• Adding a wildcard symbol may retrieve word variants: (("social interaction --") or ("((((social intervention) or (((medical intervention) OR (ethical intervention))))) or (soviet intervention)) --"))*.

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