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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("social interaction --") or ("((((social intervention) or (((policy 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 (((policy intervention) or (ethical intervention))))) or (soviet intervention)) --"))*.
• Removing quotes may allow a broader search: (( social interaction -- ) or ( ((((social intervention) or (((policy intervention) or (ethical intervention))))) or (soviet intervention)) -- ))*.

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