Perhaps you should try some spelling variations:
la litterature » a literature
y literatura » la literatura
studien der » studie der, studenten der
studien di » studien die, studien dd, studien bei
test lage » test large, test page, test stage

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