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