Place boric acid around others areas you see them coming from. Roaches clean themselves a lot. By walking in the boric acid, they automatically get some on them. When boric acid is ingested, it interferes with digestion and kills them. Vacuum your floors constantly.
Roaches detect when food is around.
After vacuuming, place a thin layer of Boric Acid on your floor. Wash dishes or place in warm sudsy water before you got o sleep. Roaches are nocturnal and will flock anywhere they can find food. If you don't have time, you can place in warm soapy water to deter them. Use a chlorine tablet or any type of tablet in your toilet.