Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
drugs studied » drugs studies, drug studies, brass studied
di filosofia » la filosofia, e filosofia
test drugs » best drugs, test drug, tests drug
studied di » studied d, studied ii, studied vi

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: test drugs studied di filosofia del literatura*.