vba code to copy specific pdf files to a specific folder which is scattered on drive

I have some specific pdf files to copy which are scattered in any folder and subfolders on drive D:\\

e.g1. Flauraudxxx.pdf,
2. pocdd_flauraud_zzz.pdf
3. FLAURAUd1023dc.pdf

VBA code to copy ALL pdf file names with the word FLAURARD to specific directory backup D:\\ FLAURARD BACKUPPDF.

Note the word may have mixed upper case and lower case .

However , I may used the same code to copy name which contains the word banking to a specific folder