Easy access, space for improvement for intuitive search of content

We currently use Coda to collect all our SOPs for different corporate roles. I find the search engine of the program can be improved to be more intuitive. I have found myself checking multiple documents before actually finding the specific information/manual I want to access. Unless the specific keywords of the manual are typed as part of my search, I would have to ask other teams to share the actual link to access the information needed. I really enjoy having the option to expand and contract titles and subtitles in order to have a wider view of the information and expand the specific subject needed.