Dired buffers output from `find-dired' commands, usually contains
filename including '/'.  Command `dired-goto-file' fails
on those files.

; emacs-lisp: 
emacs -Q $emacs-lisp
M-x find-name-dired RET *.el RET
j language/thai-word.el RET

;It cannot find the file.


In GNU Emacs 25.0.92.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.30)
  of 2016-03-22 built on calancha-pc
Repository revision: dbfbedd3d0f3afcfb811eae0e1a7b1c33fb27735