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)
"historico materialism" » "historico materiales" (Expand Search), "historia materialism" (Expand Search)
"historicos materialism" » "historicos materiales" (Expand Search), "historias 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 ("historico materialism"))) OR ("historicos materialism"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"historical materialism\") OR (\"historico materialism\"))) OR (\"historicos materialism\"))*".
• Removing quotes may allow a broader search: (((( historical materialism ) OR ( historico materialism ))) OR ( historicos materialism ))*.