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

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("historical materialism") OR ((((("historicas materialism") OR ("historica materialism"))) 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 (\"historicos materialism\"))))~".
• Removing quotes may allow a broader search: (( historical materialism ) or ((((( historicas materialism ) OR ( historica materialism ))) or ( historicos materialism ))))~.
• Adding a wildcard symbol may retrieve word variants: (("historical materialism") or ((((("historicas materialism") OR ("historica materialism"))) or ("historicos materialism"))))*.