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