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