Perhaps you should try some spelling variations:
"historical materialism" » "historica materialism" (Expand Search), "historia materialism" (Expand Search), "historico materialism" (Expand Search)
"historicas materialism" » "historica materialism" (Expand Search), "historicos materialism" (Expand Search), "historia materialism" (Expand Search)
"historicas materiales" » "historica materiales" (Expand Search), "historicos materiales" (Expand Search), "historia materiales" (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 (((\"historicas materialism\") OR (\"historicas materiales\"))))~".
• Removing quotes may allow a broader search: (( historical materialism ) OR ((( historicas materialism ) OR ( historicas materiales ))))~.
• Adding a wildcard symbol may retrieve word variants: (("historical materialism") OR ((("historicas materialism") OR ("historicas materiales"))))*.