Perhaps you should try some spelling variations:
"humanitarian intervention" » "humanitarian intervencion" (Expand Search)
"humanitaria intervention" » "humanitaria intervencion" (Expand Search)
"humanitarian intervenir" » "humanitarian intervencion" (Expand Search)
"humanizacion intervenir" » "humanizacion intervencion" (Expand Search), "organizacion intervenir" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"humanitarian intervention\") OR (((\"humanitarian intervenir\") OR (\"humanizacion intervenir\"))))) OR (\"humanitaria intervention\"))~".
• Removing quotes may allow a broader search: (((( humanitarian intervention ) OR ((( humanitarian intervenir ) OR ( humanizacion intervenir ))))) OR ( humanitaria intervention ))~.
• Adding a wildcard symbol may retrieve word variants: (((("humanitarian intervention") OR ((("humanitarian intervenir") OR ("humanizacion intervenir"))))) OR ("humanitaria intervention"))*.