Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
studium die » studium der, studium des
test forms » best forms, list forms, most forms
studium de » studium der, studium des, studium den

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: test forms ((studium de) OR (studium die)) filosofia ((y literatura) OR (la literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "test forms ((studium de) or (studium die)) filosofia ((y literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: test forms ((studium de) or (studium die)) filosofia ((y literatura) OR (la literatura))*.