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