kali 的theHarvester搜索不到信息

语句
theHarvester -d Microsoft.com -l 50 -b bing -f res.html
结果提示、

[*] Target: Microsoft.com 
                                                                             
        Searching 0 results.
[*] Searching Bing. 

[*] No IPs found.

[*] No emails found.

[*] No hosts found.



[*] Reporting started.
[*] XML File saved.
[*] JSON File saved.

这是什么原因呢？