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