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