Perhaps you should try some spelling variations:
stable student » table student, scale student, enable students
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature
less stable » less liable, cells stable
e filosofia » la filosofia
student e » student _, student a, student 1

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: "less stable student e filosofia ((de literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: less stable student e filosofia ((de literatura) OR (la literatura))*.