Of course. The teacher qualification examination does not stipulate the number of single-subject certificates. As long as you meet the conditions for entering the exam, there is no problem with how much you take. However, an applicant can only apply for the certificate recognition of 1 subject within 1 year. If you take another subject, you will have to wait two years to recognize it.
However, we should pay attention to the scope of application of the teacher qualification certificate: in the teacher qualification certificate, kindergartens are independent and cannot be used across levels. Get a junior high school teacher qualification certificate, and you can teach primary schools, high schools and secondary vocational schools.