difficult + Hard; not easy; you need to work hard to do it ☊ difficulty + Something that is hard to do ☊ difficult ☊ 
chỉn khôn ☊ difficult ☊ gay cấn ☊ difficult ☊ khó tánh ☊ difficult ☊ nan ☊ difficult + Hard; not easy; you need to work hard to do it ☊ difficulty + Something that is hard to do ☊ difficult ☊ chỉn khôn ☊ difficult ☊ gay cấn ☊ difficult ☊ khó tánh ☊ difficult ☊ nan ☊