Spanish keyword gap analysis for directory site

We are rebuilding a site that includes a directory of degrees and courses, as well as articles related to education. One of the improvements we are making to the site is the addition of faceted search for degrees and courses, so we need to do keyword research to decide what facets we need, and what combinations of facets should have their own urls for SEO purposes. This project requires fluency in Spanish, which is the site's language.