Perhaps you should try some spelling variations:
"notes dissertations" » "two dissertations", "four dissertations", "brief dissertations"
"three dissertations" » "two dissertations"
"some dissertations" » "four dissertations", "five dissertations", "six dissertations"

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