find /bin -iname 'sh*' doesn't return any result

The question is about the syntax of find command

me@222:~$ find /bin -iname 'sh*'

doesn't return any result, while:

me@222:/bin$ find -iname 'sh*'

works fine

setup info: using putty from windows to remote into ubuntu 20 LTS.

Also:
I would like to request for a syntax to properly see exactly what find is doing. for example, the files it is traversing thru, the exact path or filename string it is trying to match against, etc.

On recent Ubuntu systems, /bin is a symbolic link to /usr/bin as a result of usrmerge, and the find command does not follow symlinks by default. From man find:

   -P     Never follow symbolic links.  This  is  the  default  behaviour.
          When find examines or prints information a file, and the file is
          a symbolic link, the information used shall be  taken  from  the
          properties of the symbolic link itself.

   -L     Follow symbolic links.  [...]

   -H     Do  not  follow symbolic links, except while processing the com‐
          mand line arguments.  When find examines or  prints  information
          about  files, the information used shall be taken from the prop‐
          erties of the symbolic link itself.  The only exception to  this
          behaviour is when a file specified on the command line is a sym‐
          bolic link, and the link can be resolved.  For  that  situation,
          the  information  used is taken from whatever the link points to
          (that is, the link is followed).  The information about the link
          itself  is used as a fallback if the file pointed to by the sym‐
          bolic link cannot be examined.  If -H is in effect  and  one  of
          the  paths specified on the command line is a symbolic link to a
          directory, the contents  of  that  directory  will  be  examined
          (though of course -maxdepth 0 would prevent this).

You probably want

find -H /bin -iname 'sh*'

or

find /usr/bin -iname 'sh*'

to follow the /bin symlink but retain the default behavior below that.