Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
duale studies » scale studies, duale studium, male studies
duale studien » duale studium, scale studien, duales studium
di filosofia » la filosofia, e filosofia

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "best ((duale studies) OR (duale studien)) di filosofia del literatura".
• Adding a wildcard symbol may retrieve word variants: best ((duale studies) OR (duale studien)) di filosofia del literatura*.