delve into secret facts(/principles); delve into the abstruse (/the profundities of the unknown); search for hidden meanings; unravel mysteries ? ～，鉤深致遠(yuǎn)。(《周易·系辭上》) Search for hidden meanings and probe into profound truths.
探賾索隱tan ze suo yin
probe into profound truth
探賾索隱tàn zé suǒ yǐn
賾：深?yuàn)W；隱：秘密。探究深?yuàn)W的道理，搜索隱秘的材料。search for hidden meanings, unravel mysteries, delve into the abstruse, investigate and trace the hidden things