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