Perhaps you should try some spelling variations:
historia americana » historia mexicana, history american, history americas
lectures diel » lectures field, lectures de, lectures data
lectures food » lectures from, lectures flow, lectures broad
lecturas del » lectura del, lectura de, lectures de

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 (lectures food)))) historia americana.
• Adding a wildcard symbol may retrieve word variants: ((lecturas del) or (((lectures diel) or (lectures food)))) historia americana*.