Perhaps you should try some spelling variations:
a literatura » la literatura, a literature, y literatura
tests table » results table, test suitable, lists tables
test tables » text tables, best tables, trust tables
studien die » studie die
studien der » studie der, studenten der
filosofia a » filosofia da, filosofia la, filosofia e

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: ((tests table) OR (test tables)) ((studien die) OR (studien der)) filosofia a literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests table) or (test tables)) ((studien die) OR (studien der)) filosofia a literatura".
• Adding a wildcard symbol may retrieve word variants: ((tests table) or (test tables)) ((studien die) OR (studien der)) filosofia a literatura*.