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