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@jiahsong - thanks for reporting. I have taken a look and, you’re right, pages are returned but not the ones that contain an exact match.
Also as you pointed out, adding quotes (which we would expect to represent looking for an exact match) doesn’t change much.
One thing that I noticed is that your first two search terms, trained.savedmodel.zip and X_split_test, that don’t return results only appear in code blocks on those pages, whereas the term you said does show up, trained.tflite, is in a code block and the general text. This leads me to believe the search algorithm is skipping code blocks.
The search algorithm is controlled by our documentation hosting platform. I have reached out to them with info you provided, and linked this forum post as well. Hopefully they can make some improvements.