MS Word could not recover document after crashing

My Microsoft Office Word crashed and the error reported that the information or the document I am working might be lost, Microsoft Office Word can try to recover it for me.
And I check the option Recover my work and restart Microsoft Office Word giving the assurance that my work might be recovered.
This happened to me almost always within one hour and after the application restart, nothing is recovered.
Could you please tell me what do?

Microsoft Office Word
Microsoft Office Word has encountered a problem and needs to close. We are sorry for the inconvenience.
