Perhaps you should try some spelling variations:
"historical materialism" » "historicas materialism", "historia materialism", "historias materialism", "historical materiales", "historical materializa", "historical materializar", "historial materialism"
"historicos materialism" » "historicos materiales", "historicos materializa", "historicos materializar", "historias materialism"
"historico materialism" » "historico materiales", "historico materializa", "historico materializar", "historia materialism"
"historica materialism" » "historica materiales", "historica materializa", "historica materializar", "historia 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 ((((("historicos materialism") OR ("historico materialism"))) or ("historica materialism"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("historical materialism") OR ((((("historicos materialism") OR ("historico materialism"))) OR ("historica materialism")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"historical materialism\") or (((((\"historicos materialism\") OR (\"historico materialism\"))) or (\"historica materialism\"))))".
• Removing quotes may allow a broader search: (( historical materialism ) or ((((( historicos materialism ) OR ( historico materialism ))) or ( historica materialism )))).
• Adding a wildcard symbol may retrieve word variants: (("historical materialism") or ((((("historicos materialism") OR ("historico materialism"))) or ("historica materialism"))))*.