Use a flashlight and search again at night when your cat may feel less threatened. Look for eye reflections within a two block radius of your home
Have patience. Cats may need to hit the threshold where hunger and thirst drive them out of hiding (often 10 to 14 days later)
Approach a lost cat slowly and with care. Remember that your cat is hiding for protection and is going to be very wary of anything, even you, approaching it