Put it this way.
The way the sex work market operates, shop runners or mamasans are more inclined to bring in (chinese) talent who have already been in the game for a while. Out of these talent, most if not all don't come from wealthy families, possibly have had a kid or two while they were really young (19-23) or have sick family members to take care of, and SW is their means of making a living, not occupation of passion.
Real young chinese girls who come to study in this country usually come from upper middle class families, and sex work would not be something they typically choose.
There might be some young Chinese WLs who grew up here and chose sex work out of passion. They are very very rare.
There might be some very young Chinese uni students who do sex work on the side to build wealth rather than out of necessity. They would be harder to find than a needle in a haystack. And if you find one, they are most likely very high end and possibly only cater to chinese clients.
I believe that the above applies to ladies from other background in varying degrees.
End of the day, you get what you pay for. If you're not finding any, chances are they're not in the price bracket or in the market at all.