As much of the guidance you’re getting indicates, getting more granular and specialized combo searches in either the Explore or Identify interfaces requires manual editing of the search URL. Depending on how complicated your searches are, you may need to break them up into multiple different custom URLs that you bookmark.
There is an in-depth overview of how to manually edit search URLs at forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki-part-1-of-2/63