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