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