Saved searches
You know what would be great ? Yes, saved searches :)
The GUI may be kept simple:
- when you search something, a "save" icon appears at the right end of the search bar
- if you click the "save" icon, the search parameters are saved
- when you click on the search bar, a drop down menu appears with saved searches
- in this drop-down menu, an "delete" icon at the right end of each line allows deleting saved searches
No need to store search results, etc. Search can be made again and again, with new documents, etc.