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

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