Each track needs to be unhidden by you in order to show in search results, and tracks are hidden by default when you first upload to Productiontrax.
To do this, log into your account, go to the edit media page, select the track, and then click on the unhide button
right at the top of the attributes editor and save your changes. The search index updates every 15 minutes,
and your track will be listed in results once the index updates.
Once your tracks show in the search results, you can tell buyers to search by keyword, title, or even your name. Even better, you can use one of the remote store widgets available on your account to sell tracks from just your account on your own website.