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