Perhaps you should try some spelling variations:
"maternal nutrition" » "materials nutrition", "materia nutrition", "external nutrition", "material nutrition"
"internal nutritiva" » "integral nutritiva", "internet nutritiva"
"materna nutricion" » "materia nutricion"
"materias nutrition" » "materia nutrition", "materiales nutrition"
"material nutritivo" » "materia nutritivo"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"maternal nutrition\") OR (\"internal nutritiva\"))) OR (\"materna nutricion\"))) OR (\"materias nutrition\"))) OR (\"material nutritivo\"))~".
• Removing quotes may allow a broader search: (((((((( maternal nutrition ) OR ( internal nutritiva ))) OR ( materna nutricion ))) OR ( materias nutrition ))) OR ( material nutritivo ))~.
• Adding a wildcard symbol may retrieve word variants: (((((((("maternal nutrition") OR ("internal nutritiva"))) OR ("materna nutricion"))) OR ("materias nutrition"))) OR ("material nutritivo"))*.