Perhaps you should try some spelling variations:
presentado » presentan, presented, presentar, presentedo
presentadas » presentada, presentedas
presentaban » presentan, presentaron, presentada, presenteban
presenteban » presentedans, presentan, presenten
presentacion » presentecion
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: (presentado OR (((presentacion OR presentadas) OR (presentaban OR presenteban)) OR presenta))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(presentado or (((presentacion or presentadas) or (presentaban OR presenteban)) or presenta))~".
• Adding a wildcard symbol may retrieve word variants: (presentado or (((presentacion or presentadas) or (presentaban OR presenteban)) or presenta))*.