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

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 (\"material nutritivo\"))) OR (((\"materias nutrition\") OR (((\"materias nutrition\") OR (\"materias nutricion\"))))))~".
• Removing quotes may allow a broader search: (((( maternal nutrition ) OR ( material nutritivo ))) OR ((( materias nutrition ) OR ((( materias nutrition ) OR ( materias nutricion ))))))~.
• Adding a wildcard symbol may retrieve word variants: (((("maternal nutrition") OR ("material nutritivo"))) OR ((("materias nutrition") OR ((("materias nutrition") OR ("materias nutricion"))))))*.