We have got an interesting feature in 4.2 - a text search functionality.
In version 5 it further extended to a true text search.
If you wish to use it please make sure SQL Full Text Daemon Filter service is up and running, well at least DO NOT DISABLE IT.
In pictures, if you like to see it like this:
Please make sure you have it like this at the SQL Server side:
In Acumatica 5 it is even better:
All the best,