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