not sure about your setup, but make sure that the items that you are searching for are marked as searchable in the class setup. For instance, if you are searching for a word in the summary, but the summary is not set to searchable fofr that class, it will not return any results.
This is found in setup/classes
Also, 3.2.3 is pretty old. I would highly recommend 3.4 if you are starting a new project. It is much better....