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