Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
tests safety » guests safety, stents safety, lists safety
a literatura » la literatura, a literature, a literatur
y literatura » la literatura
test safety » best safety, rest safety, west safety
studie die » studie der

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 safety) OR (test safety)) studie die filosofica ((a literatura) OR (y literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests safety) or (test safety)) studie die filosofica ((a literatura) OR (y literatura))".
• Adding a wildcard symbol may retrieve word variants: ((tests safety) or (test safety)) studie die filosofica ((a literatura) OR (y literatura))*.