Perhaps you should try some spelling variations:
"maternal nutrition" » "material nutrition", "materials nutrition", "external nutrition", "maternal nutricion", "maternal nutritiva", "materiall nutrition"
"internal nutrition" » "internal nutricion", "internal nutritiva", "integral nutrition", "internet nutrition"
"materia nutritivo" » "materia nutritiva"
"materna nutritivo" » "materna nutritiva", "material 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 ("internal nutrition"))) OR ((("materia nutritivo") OR ("materna nutritivo"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"maternal nutrition\") OR (\"internal nutrition\"))) OR (((\"materia nutritivo\") OR (\"materna nutritivo\"))))".
• Removing quotes may allow a broader search: (((( maternal nutrition ) OR ( internal nutrition ))) OR ((( materia nutritivo ) OR ( materna nutritivo )))).
• Adding a wildcard symbol may retrieve word variants: (((("maternal nutrition") OR ("internal nutrition"))) OR ((("materia nutritivo") OR ("materna nutritivo"))))*.