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

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