You can use a simple PowerShell script to search through multiple text files in a directory. This script:
Select-String -Path C:\foofolder\txt\*.txt -Pattern beauty
. . . sets your path in the folder, c:\FooFolder\txt, and then '*.txt' searches all text files in that folder. The operator Pattern directs Powershell to search for the term that you enter after it.
The results show the number of the line in each file the hit appears on, and the rest of the line the searched for string appears in.