Populate another cell with a description from a list by typing the last word or words in an adjacent cell

[nishan247]

I have a list of Description in Column A
eg
1 Computers, Laptops & Notebooks, Laptop Accessories, Laptop Chargers
2 Computers, Laptops & Notebooks, Laptop Accessories, Laptop Cables
3 Computers, Laptops & Notebooks, Laptop Accessories, Laptop Bags
4 Security, CCTV, CCTV Cameras, Cameras IP
5 Security, CCTV, CCTV Cameras, Cameras Analog
6 Security, CCTV, CCTV Cameras, Accessories
The list could go into thousands of item descriptions

What I want is if I type in another sheet in column A for eg 'Laptop Chargers' or 'Cameras IP' I would like the entire description to populate a cell in column B
How would I go about doing this. I am not an Excel user

Thank you