Perhaps you should try some spelling variations:
dual studieren » das studieren, und studieren, zu studieren
da literatura » la literatura, a literatura, de literatura
dual studien » duale studien, duale studium, dual students
5 filosofia » a filosofia, y filosofia, _ filosofia
e filosofia » la filosofia

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

• If you are trying to use Boolean operators, they must be ALL CAPS: bursts ((dual studien) OR (dual studieren)) ((5 filosofia) OR (e filosofia)) da literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bursts ((dual studien) OR (dual studieren)) ((5 filosofia) or (e filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: bursts ((dual studien) OR (dual studieren)) ((5 filosofia) or (e filosofia)) da literatura*.