Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, da filosofia
y literatura » la literatura
e filosofia » la filosofia
best sales » best sellers
post sales » post sale

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: ((((best sales) OR (lost sales))) OR (post sales)) studien ((die filosofia) OR (e filosofia)) y literatura*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((best sales) or (lost sales))) or (post sales)) studien ((die filosofia) OR (e filosofia)) y literatura*".