Perhaps you should try some spelling variations:
americana » american, americans, america
mexicano » mexico, americano
americanus » americans, american, americas
mexicana » americana
mexican » american

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: ((((mexicana OR americana) OR mexicano) OR americanus) OR mexican) / united states.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((mexicana OR americana) or mexicano) or americanus) or mexican) / united states".
• Adding a wildcard symbol may retrieve word variants: ((((mexicana OR americana) or mexicano) or americanus) or mexican) / united states*.