The sound library tab allows for search only by Name and Description (or both by selecting All Fields).
For your specific case, I would suggest two possible solutions:
– Add a new sound library that links specifically to that folder. To do that, open the sound library tab and click on the three dots in the top right corner, then choose “Add Library”
– Add tags in the name of the files as you would for keywords. Ex. have all animal sounds named animal_nameofthespicies_volume_lenght etc.
Hope this helps!