Perhaps you should try some spelling variations:
rules studying » files studying, races studying, puzzles studying
rules studium » duales studium, furs studium, als studium
e literature » e literatur, life literature, norse literature
a filosofia » la filosofia, e filosofia, di filosofia
prose » prove

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: test ((rules studium) OR (rules studying)) a filosofia ((e literature) OR (prose literature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((rules studium) OR (rules studying)) a filosofia ((e literature) or (prose literature))".
• Adding a wildcard symbol may retrieve word variants: test ((rules studium) OR (rules studying)) a filosofia ((e literature) or (prose literature))*.