韜晦[toukai] hidden (talents, etc.)
韜略[touryaku] strategy
自己韜晦[jikotoukai] concealing one's talents, position, status, intentions, etc.
韜晦趣味[toukaishumi] propensity to efface oneself

六韜三略[rikutousanryaku] two books on the art of war in ancient China
天津鞴韜[tenshinfukutou] bellows (of the) imperial harbor
鞴韜[fukutou] (pair of) bellows