how can I access a search I did several days ago?
Unless you already set up a personal account in whatever database you were using, you probably cannot access a search you did several days ago.
Most of the databases do offer the possibility of saving searches, but you would need to sign up for a personal account within that database first, before saving the search.
Each of the databases will have help screens detailing how to do this and how it works.
Hope that helps,