Perhaps you should try some spelling variations:
historia americana » historia mexicana, history american, history americas
lecturas del » lectures diel, lectura de, lectures de
lectura del » lectura de, lettura del, lectura en
lecture de » lecture _, lecture 1, lecture 2

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: ((lecturas del) OR (((lectura del) OR (lecture de)))) historia americana.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lecturas del) or (((lectura del) OR (lecture de)))) historia americana".
• Adding a wildcard symbol may retrieve word variants: ((lecturas del) or (((lectura del) OR (lecture de)))) historia americana*.