Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
scale studien » scale studies, scale student, duale studien
di filosofia » la filosofia, e filosofia
test scale » tests scale, best scale, treat scale
studien di » studien die, studien dd, studien der

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: "test scale studien di filosofia ((y literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: test scale studien di filosofia ((y literatura) OR (la literatura))*.