Perhaps you should try some spelling variations:
la literature » la litterature, la literatura, data literature
tests scale » tests stable, sets scale, tests shall
e filosofia » la filosofia
tests safe » tests safety, tests space, tests tafel

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 safe)) study e filosofia ((la literature) OR (a literature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests scale) or (tests safe)) study e filosofia ((la literature) OR (a literature))".
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (tests safe)) study e filosofia ((la literature) OR (a literature))*.