Perhaps you should try some spelling variations:
la litterature » a literature
duale studien » duale studium, scale studien, duales studium
lage studien » frage studien, aue studien, liebe studien
di filologia » di filosofia
y literatura » la literatura

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: test ((lage studien) OR (duale studien)) di filologia ((y literatura) OR (la litterature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((lage studien) OR (duale studien)) di filologia ((y literatura) or (la litterature))".
• Adding a wildcard symbol may retrieve word variants: test ((lage studien) OR (duale studien)) di filologia ((y literatura) or (la litterature))*.