Perhaps you should try some spelling variations:
presentan » presente, presentacion, presenten, presentean
presenta » presente, presentea
presentaron » presenteron, presentacion, presentation, presentarse, presentearon
presentada » presenteda, presentado, presentar, presenteada
presented » presente, presenteed
presentea » presentera, presente, presentes, presenteea
present » presente

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (presentan OR (((presenta OR presentaron) OR ((presentada OR presented) OR presentea)) OR present))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(presentan or (((presenta or presentaron) or ((presentada OR presented) or presentea)) or present))~".
• Adding a wildcard symbol may retrieve word variants: (presentan or (((presenta or presentaron) or ((presentada OR presented) or presentea)) or present))*.