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