Perhaps you should try some spelling variations:
del literatur » model literatur, teil literatur, igel literatur
di filosofia » la filosofia, e filosofia
studies di » studies die, studies div, studies ds
test bone » best bone, test done, test tone
test one » least one, yeast one, just one

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 bone) OR (test one)) studies di filosofia del literatur".
• Adding a wildcard symbol may retrieve word variants: ((test bone) OR (test one)) studies di filosofia del literatur*.