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