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

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 1 filosofia ((de literatura) OR (de litterature))".
• Adding a wildcard symbol may retrieve word variants: less stable student 1 filosofia ((de literatura) OR (de litterature))*.