Perhaps you should try some spelling variations:
"history 20th materiales del derecho" » "history 10 materiales del derecho", "history 2 materiales del derecho", "history 2.0 materiales del derecho", "history 20th materiales de derecho", "history 20th material de derecho", "history 20th materiales el derecho"
"historia en materiales y derecho" » "historia de materiales y derecho", "historia y materiales y derecho", "historia los materiales y derecho", "historia en materiales de derecho", "historia en materiales el derecho"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("historia en materiales y derecho") or ("history 20th materiales del derecho"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("historia en materiales y derecho") OR ("history 20th materiales del derecho")).
• Removing quotes may allow a broader search: (( historia en materiales y derecho ) or ( history 20th materiales del derecho )).
• Adding a wildcard symbol may retrieve word variants: (("historia en materiales y derecho") or ("history 20th materiales del derecho"))*.