Quang Ngai is generally a safe place for solo female travelers. It's common to find locals who are friendly and welcoming to foreigners. The crime rate is fairly low. However, as with any destination, it is important to remain vigilant, especially at night, and keep your belongings secure. Many people understand English making communication easier. Be cautious with street food to avoid food poisoning. Also, road safety can be of some concern because of the chaotic traffic, especially for those not acquainted with the Vietnamese road culture.