Please help me with the terminal emulator (Samsung s4 i9500 rooted)

Firstly I'd like to thank you for this best forum.
My problem is that when I run the terminal as super user it's can't read sdcard it's give me nothing .
This is the commands
===========================
u0_a226@ja3g:/ $ su
root@ja3g:/ # cd sdcard
root@ja3g:/sdcard # ls
root@ja3g:/sdcard #
===========================
But without running as super user give me
===========================
u0_a226@ja3g:/ $ cd sdcard
u0_a226@ja3g:/sdcard $ ls
Alarms
Android
Application
DCIM
Documents
Download
INDI
Movies
Music
Notifications
Pictures
Podcasts
Ringtones
SMemo
SecretBox
ShareShot
Subtitles
UCDownloads
WhatsApp
comquoordtapatalkxdapreactivity
data
media
viber
u0_a226@ja3g:/sdcard $
=============================
I've rooted my phone with CF-Auto-Root-Chainfire‏
Please what is the solution.
Thanks again.

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