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