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

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