"has yet more" is correct and usable in written English.
You can use this expression to suggest that there is more of something. For example, "This store has yet more items to choose from."
This year, he has yet more high-profile cases.
From Iverson's vicious outburst, however, it appears he has yet more steps ahead of him.
"Mississippi Moonchile" is merely one of four existing chapters, and Ms. Roberts clearly has yet more territory to explore.
Every time I despair that the fiasco could not be made any worse, it seems that the DWP always has yet more incomprehensible decisions to astound me with.
Haute Chinoiserie in style, it's festooned with objets d'arts and has yet more magnificent chandeliers and an intricate geometric parquet floor.
Which all obviously seems a bit of a long list of things to get – until you realise that Allsopp has yet more tasks for you.
A new national government, elected in late 2017 and headed by progressive Prime Minister Jacinda Ardern, has yet more-ambitious plans.
But Radiohead will have yet more opportunities to gain fans.
Do we want this sector to have yet more power and influence?
A sceptical public will have yet more evidence that migration is a problem the politicians cannot solve.
