Polyglot Mode allows you to search for all teachers that have their instant lessons turned on, regardless of what language they are teaching!
You can turn this mode on in your profile settings.
When you have the Polyglot Mode activated, you will see Any Instant appear in the language box on the Find a Teacher page.
Selecting this option will bring back all teachers that currently have their instant lessons activated, ordered by the language that they are teaching. If a teacher teaches more than one language, you will see this teacher appear more than once.