How to search multiple file types from Windows Explorer search box?

I would like to use the Windows Explorer Search box to search for multiple file types.

Is there any supported syntax to do so?

I tried:

*.docx *.xlsx
*.docx, *.xlsx
*.docx; *.xlsx
*.docx or *.xlsx
*.docx | *.xlsx

But none of this works (while *.docx or *.xlsx alone works)

Enter it like this

*.txt OR *.PDF OR *.xls

Keep OR capital letters

You can also use wildcards (*, ?) in the search box as follows.

EXT: .txt OR .pdf OR .xls OR .doc*

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