Detailed Search - how to use text fields

Apologies if this has been answered elsewhere - I've looked around, but have not found what I'm seeking.

I'm trying to build a 'library style' search function on a portal page... The kind that has several text fields and a single search button - field like "Author", "Title", etc. However, on the search config for the detailed search, these fields are not available... I've selected these to be indexed, but to no avail. Any advice on what I may be missing, or if I need to custom build this instead of using the Detailed Search feature?

Thanks,

Phil