It would be helpful if a negation feature — or something functionally similar — were implemented for bookmark searches such that, if one had a bookmark or series of bookmarks that they didn't want included among their search results, they had the option to search for such.
For example, given bookmarks: not-in-english, pre-19th-century, owned, one could enter something like !not-in-english, !pre-19th-century, !owned to yield all bookmarks not containing any of the three.