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