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