"Tôi cười bởi vì bạn cười."
Translation:I smile because you smile.
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I only know this thanks to a trip to Wiktionary just now. If you want to understand it literally in terms of other languages:
vì = for the sake of (為)
bởi = by/due to/因って (as you might say in Japanese, but the Han character for the Vietnamese word is 被)
bởi vì = 因為（as you would say in Chinese）