How to build a search from a longer string?

Please try the visual called "Text Filter".

You can do it by downloading a Text search slicer. Learn how here

https://appsource.microsoft.com/en-us/product/power-bi-visuals/databrotherssro1596013704866.dbi_text_search_slicer?tab=overview

However, I suspect each of your records has comma delimited tags?

For example, with a Product name the and Tags

TV, speaker, screen, aerial, remote

Radio, aerial, speaker, LCD display

Phone, aerial, speaker, screen

It is best practice to use Power Query to parse these to a 2-column table  with Product  and one Tags

TV, speaker,

TV, screen,

1. aerial

TV, remote

Radio, aerial

Radio, speaker

Radio, LCD display

Then just user a standard filer with the search option turned on.

See https://learn.microsoft.com/en-us/power-bi/guidance/import-modeling-data-reduction

This will not increase storage; it will actually reduce storage and improve performance because Power BI uses a columnar rather than a tabular database. Power  BI will process millions of rows with just 2 short columns much faster than searching for a string in long text. It is a concept that novices struggle to understand.

I am an unpaid volunteer help, please show your thanks by clicking thumbs up and accepts as solution.