The whole idea behind recovering unsaved documents is based on the fact that MS Office saves temporary states of a specific document while you edit it. So the main goal here is to find those files.
Disk Drill offers free data protection algorithms Guaranteed Recovery and Recovery Vault. By enabling them you get a digital warranty the files you delete in future (accidentally and even intentionally) are recoverable at a much higher probability rate. You would be searching for unsaved Word and Excel documents among protected data if you had enabled these Disk Drill's features prior to data loss.
In comparison to Quick Scan and Partition Recovery, Deep Scan is scanning through the raw binary data on a hard drive. For Deep Scan, all the data is just nameless series of bytes. Restructuring the accessible fragments of various file formats, Disk Drill gets them back to life, including your unsaved documents.