All PolyGram karaoke LDs were released in Hong Kong, Singapore, and Malaysia in the 1990s and they are extremely hard to find. They can be easily bought from Taobao China.
Eventually, a small number of MVs from one of the LDs were uploaded to various websites by many users.
From 2010 to 2016, half of the various PolyGram karaoke LDs were uploaded to YouTube by the YouTube user, wangto040889. The remaining MVs from them that were used in other PolyGram karaoke LDs have to be skipped over.
Right now, wangto040889's YouTube account got suspended, but you can find some of the MVs from one of the LDs on the Internet.