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Custom search across dependent fields

I currently have a set of four dependent dropdowns added to the case object.

The dropdowns are used to narrow down the type of request that a customer is trying to submit.  The problem is that we have around 100 potential options and it can be very difficult at times to find the appropriate choice.

Is it possible to create a search function that would display alongside the dropdowns which would search those fields and display possible selections?  Ideally, it would show the best options and if one were clicked it would fill in the dropdowns with the selection chosen.

This would preferably be done in lightning as we are kicking off our migration, but a standard visual force page would be welcome in the meantime as the switch will likely take a while.