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