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

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

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