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

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