[dalys]

I think that might be hard even if there was a specific target that was "People who work at surfing schools" because people don't really keep their FB job description up to date.

I would just target "Surfboard (sporting goods)", "Surfing (water sport)" and similar and then let the FB algorithm do it's magic. I.e. create a very broad targeting for your ad and then let the ad run for a while and get results, and those results will let FB automatically fine tune the targeting for you. It costs some money but it will probably be better in the end. Unofficial rumours says you need around 50 conversion events on ad for the ad to be fully "trained", which can mean a couple of hundred dollars.

Remember the targets you add have a OR function between them, unless you use the "Narrow audience" button in the targeting.

If you really want to narrow down you could do "Surfing (water sport)" and narrow the audience and find some interest that is AND <insert teaching-related interest targeting>. People that work as surf school teachers could possibly have been identified by FB with some kind of teaching-interest.