Perhaps you should try some spelling variations:
la litterature » a literature
filosofia la » filosofia da, filosofia le, filosofica da
tests duale » tests due, tests damage
tests scale » tests stable, sets scale, tests safe
studie 1 » studie 2

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: ((tests duale) OR (tests scale)) ((studie 1) OR (studie _)) filosofia la litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests duale) OR (tests scale)) ((studie 1) or (studie _)) filosofia la litterature".
• Adding a wildcard symbol may retrieve word variants: ((tests duale) OR (tests scale)) ((studie 1) or (studie _)) filosofia la litterature*.