Perhaps you should try some spelling variations:
le letterature » e letterature, la litterature, de litterature
e letteratura » y literatura, e literatur
e filosofia » la filosofia
beste oder » beute oder, werte oder, heute oder
beste der » besten der, besteht der, beste fur
studie e » studie 2, studie _, studie 1

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: ((beste der) OR (beste oder)) studie e filosofia ((le letterature) OR (e letteratura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((beste der) or (beste oder)) studie e filosofia ((le letterature) OR (e letteratura))".
• Adding a wildcard symbol may retrieve word variants: ((beste der) or (beste oder)) studie e filosofia ((le letterature) OR (e letteratura))*.