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

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