Perhaps you should try some spelling variations:
historia mexican » historia mexicana, historia mexico, history mexican
lecturas de » lecturas del, lecteurs de, lecture de
lecturas en » lectura en, lectures et, lecturas y
lectures de » lectures _, lectures 1, lectures 2
lectura de » lectura del, lecture de, lecture des

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 (lecturas en))) OR (lectura de))) OR (lectures de)) historia mexican.
• Adding a wildcard symbol may retrieve word variants: ((((((lecturas de) or (lecturas en))) or (lectura de))) or (lectures de)) historia mexican*.