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

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