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

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