How do China people get a tourist visa to the United States in Malaysia?

The actual route is as follows: Shanghai, China-Kuala Lumpur, Malaysia-Singapore-Kuala Lumpur, Malaysia-Shanghai, China. At present, I have obtained a visa to enter Malaysia for the first time, and then I will stay there for about one month after entering Kuala Lumpur for the first time, but the visa will expire; So, if you apply for a visa to Singapore in Malaysia, stay in Singapore for about 2-3 days, and then go back to Kuala Lumpur immediately, so that you can enter Malaysia (Kuala Lumpur) for the second time, stay in landing visa for another month, and then return home.