You can simply find all class attribute by using c = soup.find_all(class_="kt-post-card__top-description kt-post-card-description")
The following code will get the result
import requests
from bs4 import BeautifulSoup
url = 'https://divar.ir/s/tehran/auto'
test_page = requests.get(url).text
soup = BeautifulSoup(test_page,'html.parser')
c = soup.find_all(class_="kt-post-card__top-description kt-post-card-description")
for i in c:
print(i.text)
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