Be careful not to box yourself into a concrete search term for your topic. Think of synonyms for your subject - broader terms, related terms, and narrower terms. Using this strategy will guarantee a wider selection of materials. Be aware, too, that some search terms may be uncomfortable to think or say out loud - but could yield possible results.
Neurodiversity is a fairly recent term that encompasses a variety of differences in brain functioning. There is, however, a difference between mental disorders (e.g., bipolar) and diversity of ability/disability. Ergo, this page does not feature titles that deal with depression and anxiety. For an adequate framework, reference this article from Psychology Today. It can provide some ideas for other keywords!
Possible search terms: ADHD, synesthesia, autism, dyspraxia, asperger's, learning disability