Perhaps you should try some spelling variations:
duale studien » scale studien, duales studium, dualen studium
duale studium » duales studium, dualen studium, das studium
y literatura » la literatura
e filosofia » la filosofia
filosofia y » filosofia e, filosofia _, filosofia de
testo » test, tests, texto

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: "testo ((duale studien) OR (duale studium)) e filosofia y literatura".
• Adding a wildcard symbol may retrieve word variants: testo ((duale studien) OR (duale studium)) e filosofia y literatura*.