Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
filosofia la » filosofia da, filosofia le, filosofica da
tests scale » tests stable, sets scale, tests safe
tests tafel » test tafel, tests safe, taits tafeln
studien la » studien lap, studien a, studien l

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 scale) OR (tests tafel)) studien la filosofia la literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (tests tafel)) studien la filosofia la literatura*.