Thanks everyone
Finally, after reading all the replays, I can find the files that I want faster
I combine all the suggestion, and here's what I've done
First, find all files on the path that I want to search with. Put the output to some file
And after that, do while loop for every files from the list of files that I want to search
It still needs some tweaks though, but I guess, it's much better now
Thanks everyone for the reply
