費盡心機

to rack one's brains for schemes (idiom) / to beat one's brains out

surname Fei

to cost / to spend / fee / wasteful / expenses

to use up / to exhaust / to end / to finish / to the utmost / exhausted / finished / to the limit (of sth) / all / entirely

with all of one's heart

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

thinking / scheme

(bound form) machine; mechanism / (bound form) aircraft / (bound form) an opportunity / (bound form) crucial point; pivot / (bound form) quick-witted; flexible / (bound form) organic