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

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 ("external nutrition"))) OR ("materia nutrition"))) OR ("materna nutrition"))) OR ("material nutritivo"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"maternal nutrition\") OR (\"external nutrition\"))) OR (\"materia nutrition\"))) OR (\"materna nutrition\"))) OR (\"material nutritivo\"))*".
• Removing quotes may allow a broader search: (((((((( maternal nutrition ) OR ( external nutrition ))) OR ( materia nutrition ))) OR ( materna nutrition ))) OR ( material nutritivo ))*.