Merge and Search field

Dear Community,

I am looking for help for what I am sure is a very basic issue. 

Below the "data base" where each client could have several order id, so I merged all order id in one column using coma as a separator. I have merged all order id so I could use a search field. 

When I search for the client id, no issue but when I search for one (only one) order id on the search field, I have no result.

If someone can help, that will be great.

thanks,

Kasiop