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

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 ("maternal nutritiva"))) OR ((("maternal nutricion") OR ("materiales nutricion"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"maternal nutrition\") OR (\"maternal nutritiva\"))) OR (((\"maternal nutricion\") OR (\"materiales nutricion\"))))".
• Removing quotes may allow a broader search: (((( maternal nutrition ) OR ( maternal nutritiva ))) OR ((( maternal nutricion ) OR ( materiales nutricion )))).
• Adding a wildcard symbol may retrieve word variants: (((("maternal nutrition") OR ("maternal nutritiva"))) OR ((("maternal nutricion") OR ("materiales nutricion"))))*.