FM / km_KH.UTF-8

/usr/share/X11/locale/km_KH.UTF-8

Name	Size	Mode	Actions
Compose	210	0644	edit dl rm
XI18N_OBJS	299	0644	edit dl rm
XLC_LOCALE	45	0644	edit dl rm

Edit: /usr/share/X11/locale/km_KH.UTF-8/Compose (210B)

include "/usr/share/X11/locale/en_US.UTF-8/Compose" # Khmer digraphs : "ាំ" : "ោះ" : "េះ" : "ុំ" : "ុះ"