Crystal Helper has a limitation which prevents the user from adding a product / link / image to their post for items which have many matches to the search term. There is a limited number of displayed results when you search, so if the item has many matches, and the one you want is not within that displayed list, then you cannot insert the one you want. There is no workaround.
We need to design an improved ux for searching, including a way to view all matching results, and/or a way to filter them, and/or a way to search within categories