Perhaps you should try some spelling variations:
"historical materialism" » "historica materialism" (Expand Search), "historico materialism" (Expand Search)
"historical materiales" » "historica materiales" (Expand Search), "historico materiales" (Expand Search)
"historicas materialism" » "historica materialism" (Expand Search), "historico materialism" (Expand Search)
"historicos materialism" » "historico materialism" (Expand Search), "historica 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 ("historia materialism"))) OR ((("historicas materialism") OR ("historicos materialism"))))) OR ("historical materiales"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"historical materialism\") OR (\"historia materialism\"))) OR (((\"historicas materialism\") OR (\"historicos materialism\"))))) OR (\"historical materiales\"))".
• Removing quotes may allow a broader search: (((((( historical materialism ) OR ( historia materialism ))) OR ((( historicas materialism ) OR ( historicos materialism ))))) OR ( historical materiales )).
• Adding a wildcard symbol may retrieve word variants: (((((("historical materialism") OR ("historia materialism"))) OR ((("historicas materialism") OR ("historicos materialism"))))) OR ("historical materiales"))*.