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

• Removing quotes may allow a broader search: (( national preventive mechanisms ) OR ( tional prevention mechanisms )).

Perhaps you should try some spelling variations:
preventive mechanisms » protection mechanisms (Expand Search)
prevention mechanisms » protection mechanisms (Expand Search), resolution mechanisms (Expand Search), reparation mechanisms (Expand Search)
national preventive » operational preventive (Expand Search), national productive (Expand Search), national perspectives (Expand Search)
tional prevention » criminal prevention (Expand Search), situational prevention (Expand Search), social prevention (Expand Search)