书柬

书柬	shū jiǎn	variant of 书简
书	Shū	abbr. for 书经
书	shū	book / letter / document / CL:本,册,部 / to write
柬	Jiǎn	abbr. for 柬埔寨, Cambodia
柬	jiǎn	card / note / letter / old variant of 拣