I find their search amazing. What's your issue with it?
They stem words aggressively, so searching for "repeater", which is a less common, specific term, gives you results including "repeat", a commonly used word. And there's no way to do an exact word search.
I just googled "how to use openllm" as an example to test your thesis, and the results look very relevant to me.
https://www.google.com/search?client=safari&rls=en&q=how+to+...
"Showing results for how to use openlm
Search instead for how to use openllm"