Perhaps you should try some spelling variations:
y literatura » la literatura
studies lia » studies lca, studies li, studies limma
studies lit » studies list, studies li, studies light
filosofia y » filosofia e, filosofia _, filosofia de
test scale » tests scale, best scale, rest scale

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: "test scale ((studies lia) OR (studies lit)) filosofia y literatura".
• Adding a wildcard symbol may retrieve word variants: test scale ((studies lia) OR (studies lit)) filosofia y literatura*.