Perhaps you should try some spelling variations:
historia americana » historia mexicana, history american, history americas
lectures diel » lectures field, lectures de, lectures data
lecturas del » lectura del, lectura de, lectures de
lettura del » lectura del, lettera del, lettura dei

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