Perhaps you should try some spelling variations:
ones studenten » eines studenten, des studenten, von studenten
la litterature » a literature
y filosoficos » y filosofico, y filosofia, e filosofica
5 filosofico » y filosofico, e filosofica, e filosofiche
test ones » test one, best ones, tested ones

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: test ones studenten ((5 filosofico) OR (y filosoficos)) la litterature*.