Perhaps you should try some spelling variations:
"maternal nutrition" » "materials nutrition", "internal nutrition", "external nutrition", "maternal nutritiva"
"maternal nutricion" » "materials nutricion", "internal nutricion", "external nutricion"
"materia nutrition" » "materia nutritiva"
"material nutrition" » "material nutritiva"
"materna nutritivo" » "materna 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 nutricion\"))) OR (((((\"materia nutrition\") OR (\"materna nutritivo\"))) OR (\"material nutrition\"))))~".
• Removing quotes may allow a broader search: (((( maternal nutrition ) OR ( maternal nutricion ))) OR ((((( materia nutrition ) OR ( materna nutritivo ))) OR ( material nutrition ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("maternal nutrition") OR ("maternal nutricion"))) OR ((((("materia nutrition") OR ("materna nutritivo"))) OR ("material nutrition"))))*.