Perhaps you should try some spelling variations:
"historical materialism" » "historica materialism", "historia materialism", "historico materialism", "historical materiales", "historical materializa", "historical materializar"
"historicas materialism" » "historicas materiales", "historicas materializa", "historicas materializar", "historica materialism", "historias materialism", "historia materialism"
"historicos materialism" » "historicos materiales", "historicos materializa", "historicos materializar", "historico materialism", "historica materialism"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("historical materialism") or ((("historicas materialism") OR ("historicos materialism"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("historical materialism") OR ((("historicas materialism") OR ("historicos materialism")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"historical materialism\") or (((\"historicas materialism\") OR (\"historicos materialism\"))))".
• Removing quotes may allow a broader search: (( historical materialism ) or ((( historicas materialism ) OR ( historicos materialism )))).
• Adding a wildcard symbol may retrieve word variants: (("historical materialism") or ((("historicas materialism") OR ("historicos materialism"))))*.