Search order by public ID

Hi, I have a usecase where I am trying to look up details about an order given only the public ID of that order. I have been exploring the FindOrders API (https://roserocket.readme.io/reference/find-orders), passing in the public ID as the "search term" argument, but it seems like it doesn't work for some orders. Could you share insights into how the API is searching across orders and what massaging I have to do so that my Order is searchable in this way?

Thanks.