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