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

You may be able to get more results by adjusting your search query.

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