Perhaps you should try some spelling variations:
presentaban » presentan, presentada, presentadas, presenteban
presentaron » presentacion, presentation, presentan, presentanon, presentarseon, presenteon, presenteron
presented » presente, present, presentan
presentaaan » presentaran, presentarian, presentan, presenteaan
presentar » presentan, presentarse, presente, presenter
presenta » 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: ((presentaban OR presentaron) OR ((presented OR (presentaaan OR presentar)) OR presenta))~.
• Adding a wildcard symbol may retrieve word variants: ((presentaban or presentaron) or ((presented or (presentaaan or presentar)) or presenta))*.