Perhaps you should try some spelling variations:
mexicanos » mexicana, mexicanas, mexicos, americanos
mexicos » mexico, mexikos, lexicos
mexicano » mexicana, mexico, americano
americanos » americano, americanus, american
americans » american, america
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: (((((mexicanos OR mexicos) OR mexicos) OR mexicano) OR (americanos OR americans)) OR mexican) / united states.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((mexicanos OR mexicos) or mexicos) or mexicano) or (americanos or americans)) or mexican) / united states".
• Adding a wildcard symbol may retrieve word variants: (((((mexicanos OR mexicos) or mexicos) or mexicano) or (americanos or americans)) or mexican) / united states*.