Perhaps you should try some spelling variations:
"notes dissertations" » "two dissertations", "four dissertations", "three dissertations"
"five dissertations" » "four dissertations", "die dissertation", "ii dissertations"
"six dissertations" » "ii dissertations", "some dissertations", "_ dissertations"

Try widening your search to All Fields.

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: (((("six dissertations") OR ("five dissertations"))) OR ("notes dissertations")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"six dissertations\") OR (\"five dissertations\"))) or (\"notes dissertations\"))".
• Removing quotes may allow a broader search: (((( six dissertations ) OR ( five dissertations ))) or ( notes dissertations )).
• Adding a wildcard symbol may retrieve word variants: (((("six dissertations") OR ("five dissertations"))) or ("notes dissertations"))*.