Perhaps you should try some spelling variations:
historia americana » historia mexicana, history americas, history america
history american » history americas, history america, history's american
lecturas de » lecturas del, lectura de, lecteurs de
lectures de » lectures _, lectures 1, lectures 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 de) OR (lectures de)) ((historia americana) OR (history american)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lecturas de) or (lectures de)) ((historia americana) OR (history american))".
• Adding a wildcard symbol may retrieve word variants: ((lecturas de) or (lectures de)) ((historia americana) OR (history american))*.