While some informal exchanges for RUB might exist, they often come with unfavorable rates or risks. USD can be exchanged for Vietnamese Dong (VND) in various locations, including exchange offices, jewelry stores, and sometimes hotels. Jewelry stores are often reported to offer the best rates. Euros are also generally exchangeable in Vietnam without significant issues. Exchange rates at Cam Ranh Airport are typically less competitive compared to those in the city. It's advisable to carry a mix of USD and VND upon arrival and to seek out reputable exchange points for better rates.
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