Perhaps you should try some spelling variations:
stable studien » stadler studien, scale studien, table studies
die filosofia » di filosofia, de filosofia, e filosofia
da literatura » la literatura, de literatura, na literatura
tests stable » tests table, sets stable, test table
a literatura » la literatura, a literature, y literatura
studien die » studie die, studien der

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: "tests stable studien die filosofia ((da literatura) OR (a literatura))*".