Perhaps you should try some spelling variations:
para literatura » pela literatura, pena literatura, armas literatura
filosofia para » filosofia da, filosofia morale
equity scale » equity sale, equity style, equity share
studien a » studien am, studien _, studien 4
studien 3 » studien _, studien 4, studien 5

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: "equity scale ((studien a) OR (studien 3)) filosofia para literatura".
• Adding a wildcard symbol may retrieve word variants: equity scale ((studien a) OR (studien 3)) filosofia para literatura*.