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 "

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"lecturas del \") OR (\"lectures diel \"))historia americana\"\"".
• Removing quotes may allow a broader search: (( lecturas del ) OR ( lectures diel ))historia americana.