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