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

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