Hi Manish 

VH stands for VISUALLY HANDICAPPED

OH stands for ORTHOPEDICALLY HANDICAPPED

HH stands for HEARING HANDICAPPED 

OH includes:

- Locomotor Disability, i.e. disability of Bones, Muscles or joints due to which a person feels difficulty in movement of limbs. 

- Cerebral Palsy

VH includes:

- Blindness refers to any of the following conditions:

1. Total loss of eyesight 

2. Limitation of field of vision at an angle of 20 degrees or worse

HH includes :

Loss of sixty decibels or more in the ear.