Perhaps you should try some spelling variations:
historia americana » historia mexicana, history american, history americas
lecture desl » lecture de, lecture dans, lecture day
lecture des » lecture de, lecture dans, lecture day

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: ((lecture des) OR (lecture desl)) historia americana.
• Adding a wildcard symbol may retrieve word variants: ((lecture des) or (lecture desl)) historia americana*.