Perhaps you should try some spelling variations:
filosofica da » filosofia da, filosofia de, filosofia di
da literatura » la literatura, a literatura, de literatura
best scale » bast scale, rest scale, burst scale
studien di » studien die, studien der, studien bei
studien dd » studies dd, studien der, studien die

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: "best scale ((studien di) OR (studien dd)) filosofica da literatura".
• Adding a wildcard symbol may retrieve word variants: best scale ((studien di) OR (studien dd)) filosofica da literatura*.