Correct

可劲

/ kějìn / 
Strokes

Definition

vigorously/to the utmost/to the best of one's ability

Example

As a Verb

try one's best; exert all one's strength

1
Kě
可
jìn
劲
hǎn
喊

shout at the top of one's voice/lungs

2
Kě
可
jìn
劲
gàn
干

do one's utmost