Perhaps you should try some spelling variations:
"historical materialism" » "historico materialism" (Expand Search), "historicos materialism" (Expand Search), "historicol materialism" (Expand Search)
"historical materiales" » "historico materiales" (Expand Search), "historicos materiales" (Expand Search), "historicol materiales" (Expand Search)
"historica materialism" » "historico materialism" (Expand Search)
"historicas materialism" » "historicos materialism" (Expand Search), "historico materialism" (Expand Search)

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 ((("historica materialism") OR ("historia materialism"))))) OR ("historical materiales"))) OR ("historicas materialism"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"historical materialism\") OR (((\"historica materialism\") OR (\"historia materialism\"))))) OR (\"historical materiales\"))) OR (\"historicas materialism\"))".
• Removing quotes may allow a broader search: (((((( historical materialism ) OR ((( historica materialism ) OR ( historia materialism ))))) OR ( historical materiales ))) OR ( historicas materialism )).
• Adding a wildcard symbol may retrieve word variants: (((((("historical materialism") OR ((("historica materialism") OR ("historia materialism"))))) OR ("historical materiales"))) OR ("historicas materialism"))*.