The first advice about SEBLOD storage is to create your fields from a content type edition and to do nothing! SEBLOD will manage for you the storage. By default a field is saved with "Standard" mode. That means a table linked to your content type is created and this field added in this table. So in this case the field can only be used with this content type.
A field save in jos_cck_store_item_content is called a "common" field. This field can be used in any content type.
SEBLOD is able to search a field with any storage type of SEBLOD.
How do you do your search? By a SEBLOD list? Screenshots, details please.