Are you searching for 1. your exact business name (to verify the listing exists) or 2. for keywords related to your business?
If it's the latter, there are a number of reasons why this may not be showing.
1. If your business listing has been verified and you search for your exact business name or phone number, your listing should appear.
2. If you search for a business category or keywords related to your business - for example 'Cleaning Services' your business listing may not appear.
This video from Google covers some of the possible reasons in more detail: I can’t find my business on Google
I hope this is of some help.