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

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