Perhaps you should try some spelling variations:
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature
dd filosofia » di filosofia, de filosofia, da filosofia
burst scale » bast scale, best scale, rust scale
just scale » rust scale, must scales, trust scale
studien dd » studies dd, studien der, studien die

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: ((burst scale) OR (just scale)) studien dd filosofia ((de literatura) OR (la literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((burst scale) or (just scale)) studien dd filosofia ((de literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: ((burst scale) or (just scale)) studien dd filosofia ((de literatura) OR (la literatura))*.