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Transit via China to Vietnam: China offers a visa-free transit policy for travelers. No specific Chinese visa is required for standard transit routes (e.g., bus from Zabaikalsk to Manzhouli, train to Beijing, then flight to Hanoi).

Regarding transit in China (specifically Guangzhou and Phnom Penh): If transiting on a single ticket with the same airline and checked baggage to the final destination, no exit from the transit zone or visa is required. In the new Phnom Penh International Airport (Techo International Airport), there is an airside transit zone for international transfers. If both flights are international and the airline handles the transit, passport control can be bypassed. A transit visa is not needed if staying within the transit area. An e-Arrival card is not required for such transits.

Transit through Guangzhou without a visa is possible if you remain within the transit zone. If exiting the transit zone is required, it is not feasible within a 2-hour timeframe.

Student visas in Vietnam are primarily issued for studying the Vietnamese language, typically valid for up to 6 months. It is distinct from the educational visa processes in neighboring Thailand.

It might be possible to obtain a student visa in Vietnam for the purpose of studying English. To explore this option, individuals should research Vietnamese educational institutions that offer English language programs and inquire about their visa sponsorship capabilities. Contacting specific universities or language schools directly would be the best approach to understand the application process and requirements.