Currently the "Search files" query on the "Explore workspace" tab treats queries with multiple words separated by a space as if they were one element.

So a search for (without quotes) "wall normal" would not find
SteelWallNormal.png nor
shortwallnormal.png
etc.
but it currently would find things like
SteelWall Normal.png or
shortwall normal.png

I suggest treating words separated by spaces as multiple elements that must all exist in the filename, which would result in returning all of the examples above.