Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
filosofia e » filosofia de, filosofia del
test scale » tests scale, rest scale, treat scale
best scale » bast scale, rest scale, burst scale
study la » study law, study lay, study lca

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) OR (best scale)) study la filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: ((test scale) OR (best scale)) study la filosofia e literatura*.