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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("maternal nutrition") OR ((((("material nutrition") OR ("material nutritiva"))) OR ("material nutritivo"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"maternal nutrition\") OR (((((\"material nutrition\") OR (\"material nutritiva\"))) OR (\"material nutritivo\"))))".
• Removing quotes may allow a broader search: (( maternal nutrition ) OR ((((( material nutrition ) OR ( material nutritiva ))) OR ( material nutritivo )))).
• Adding a wildcard symbol may retrieve word variants: (("maternal nutrition") OR ((((("material nutrition") OR ("material nutritiva"))) OR ("material nutritivo"))))*.