Perhaps you should try some spelling variations:
mittelalterlichen geistesgeschichte » mittelalterliche geschichte
geistesgeschichte series » zeitgeschichte series, kirchengeschichte series, kulturgeschichte series
zur mittelalterlichen » der mittelalterlichen, ihre mittelalterlichen, im mittelalterlichen
text zur » texte zur, text zum, text zu

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

• Performing a fuzzy search may retrieve terms with similar spellings: das heilige (reich or reach). text zur mittelalterlichen geistesgeschichte series~.
• If you are trying to use Boolean operators, they must be ALL CAPS: das heilige (reich OR reach). text zur mittelalterlichen geistesgeschichte series.
• Adding a wildcard symbol may retrieve word variants: das heilige (reich or reach). text zur mittelalterlichen geistesgeschichte series*.