You can find your bookmarks through various ways.
Find bookmarks by tag
Find bookmarks by full text search
Find bookmarks by List
Find bookmarks by site
Full text search feature is a premium feature.Â
1) Get the snapshot of your bookmarks, ie the cached pages.
2) Index them
3) Provide full text search feature for you
The full text search feature is not a real time feature since the system needs some time to get the snapshot and index the web pages.