Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
studenten a » studenten _, studenten 5, studenten 3
a filosofia » la filosofia, e filosofia, di filosofia
soft rank » soft rock, soft ray, soft rays
best rate » best state, cost rate

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: "((soft rank) OR (best rate)) studenten a filosofia del literatura*".