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

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