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

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