with open('/home/x79/sisvietnamvn_01/BV_DHYD_HCM/Đội ngũ bác sĩ UMC.html', 'r', encoding='utf-8') as f:
    text = f.read()

import re
if "Khoa Da liễu" in text:
    print("Found 'Khoa Da liễu'!")
    matches = re.finditer(r'.{0,50}Khoa Da liễu.{0,50}', text)
    for m in matches:
        print("Context:", m.group(0))
else:
    print("Not found 'Khoa Da liễu'")