Perhaps you should try some spelling variations:
master studenten » master students, masters student's, alte studenten
late studenten » late student, alte studenten, die studenten
le literatura » la literatura, e literatura, de litteratura
de literatura » de litterature, la literatura, y literatura

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: sets ((late studenten) OR (master studenten)) la filosofia ((le literatura) OR (de literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "sets ((late studenten) or (master studenten)) la filosofia ((le literatura) OR (de literatura))".
• Adding a wildcard symbol may retrieve word variants: sets ((late studenten) or (master studenten)) la filosofia ((le literatura) OR (de literatura))*.