Typing with a vibrating and noisy keyboard can be unsettling for those nearby.
To disable sound and vibration on the keyboard of Lenovo Phab 2GB tablet, follow these steps:
Step 1: Go to 'Settings'.

Go to 'Settings'
Step 2: Choose 'Language and input methods'.

Select 'Language and input methods'
Step 3: Choose 'Google Keyboard'.

Select 'Google Keyboard'
Step 4: Choose 'Options'.

Choose 'Options'
Step 5: Turn off sound and vibration on the keyboard.

Turn off keyboard sound and vibration
Wishing you all success.