Keyword search is a quick way to find a desired listing. Simply type in a few words best describing the object for which you are searching, specify your zip code and the distance and hit the Search button. The returned matches will be only those items that contain all of the words that were typed in by you.
Be very accurate about spelling during keyword search or you will have difficulty finding anything.
Try avoiding common words that relate to entire industry rather than a specific object. For instance it would be useless to search for a "used cars" or a "homeless pets" among classified ads because 99% of them are those.
Keyword search has one advantage over Advanced search: it searches within listings' descriptions as well as other listings' fields.