Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
e literatura » y literatura, e literatur, a literatura
day studium » das studium, dem studium, d studium
units day » units daily, units today, units data

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: "units day studium _ filosofia ((e literatura) OR (de literatura))*".