Yifei,

I don't understand the issue.
I DL'ed your file and proceeded as follows
Edit/Settings/General/Auto Convert Properties checked (On)

Find Data
Find POINTS in test_data.vtu
Loc(0) is >= 0.009
Run Selection Query
Extract Selection

This correctly extracted the 1 point met that requirement

If I change to a query of
(Loc[:,0] >= .008) & (Loc[:,1] >= -.0004)  then it correctly selects the single 
point that meets that criteria.

Perhaps the difficulty is because you haven't  set Auto Convert Properties

Hope this helps.
Dennis
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