HoudahSpot searches always go into subfolders. For example, when you search in your home folder, you can find letters saved to your Documents folder.
When you don’t want files from a subfolder to clutter search results, excluding the subfolder is easy: just drag the folder from the breadcrumb path at the bottom of the HoudahSpot window to the Locations/Exclude list.
You can repeat the procedure to exclude more folders. But if you want to see only results from the top level folder, it is easier to use the path filter to simply hide results from nested folders.
The HoudahSpotInfo pane shows all metadata Spotlight has recorded about a particular file. This includes generic attributes (file name, dates, etc.) as well as custom attributes filled in by the Spotlight importer responsible for indexing the file. You can use any of these attributes to find similar files.
Tembo helps you sort through search results by providing context-sensitive filters. The drill-down views for different groups show different filters. Most filters provide a list of values found in the current search results. Select a value to see only results matching that value.
E.g. the filter sidebar for the Documents group list file types. The PDF Documents group can be filtered by author. Images can be filtered by resolution and file type. Etc.