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