You can get back from recycle bin/ .bak file, but if the parameters set as "delete permanently", then not possible to get this file again. You can try with some 3rd party tools, but that may not 100% workable.
You can also use System Restore option. System Restore helps you to restore your computer's system files to an earlier point in time. It is a way to undo system changes made on your computer without affecting your personal files, such as e‑mail, documents, or photos. I hope by using this, you will get back your Word file.
For more info please visit: http://windows.microsoft.com/en-us/windows7/restore-system-files-and-settings
If this is a personal computer, you may be able to get it back from the recycle bin. If it's a work computer, it may be possible that it gets backed up from the network if it is a shared document.
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