Perhaps you should try some spelling variations:
"historical materialism" » "historicos materialism" (Expand Search), "historical materiales" (Expand Search)
"historica materialism" » "historica materiales" (Expand Search)
"historico materialism" » "historico materiales" (Expand Search)
"historicas materialism" » "historicas materiales" (Expand Search), "historicos materialism" (Expand Search)
"historia materialism" » "historia materiales" (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 ("historica materialism"))) OR ("historico materialism"))) OR ((("historicas materialism") OR ("historia materialism"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"historical materialism\") OR (\"historica materialism\"))) OR (\"historico materialism\"))) OR (((\"historicas materialism\") OR (\"historia materialism\"))))".
• Removing quotes may allow a broader search: (((((( historical materialism ) OR ( historica materialism ))) OR ( historico materialism ))) OR ((( historicas materialism ) OR ( historia materialism )))).
• Adding a wildcard symbol may retrieve word variants: (((((("historical materialism") OR ("historica materialism"))) OR ("historico materialism"))) OR ((("historicas materialism") OR ("historia materialism"))))*.