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

Try widening your search to All Fields.

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

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