Perhaps that is because they do not have any cows to make milk to make the cheese. All the cattle were killed off years ago because of a mad cow disease scare. You may have seen in the news of the rioting when they tried to reintroduce beef from the USA.
You're sadly misinformed. Yes, a number of Asian countries did not & still do not want U.S. beef because of Mad Cow Disease, but "all the cattle" in Asian countries weren't "killed off" because of it.
The reason behind Asian countries not overflowing with cattle is because the climate & landscape aren't suitable for large-scale production of them. This is why you more often see pigs, goats, sheep, water buffalo, yak, & other grazing animals in Asian cuisine more than home-produced beef.
And except for pigs, all the other animals listed above are definitely used to produce dairy products - cheese among them. It's just not the type of cheeses that we're familiar with or that are available for export.
As far as salads go, consuming vegetables raw is a fairly recent thing in China. And in fact, those living in the rural areas still do not consume vegetables raw - only cooked or pickled. This is due to the fact that many farms use human waste as a fertilizer, which obviously can & does make raw vegetables unsafe.