Correct

巧劲儿

/ qiǎo jìnr / 
Strokes

Example

As a Noun

knack; trick

1
Gàn
干
zhèzhǒng
这种
huór  
活儿
de
得
shǐ
使
qiǎo
巧
jìnr  
劲儿
  
。

It takes some knack to do the job.

As a Noun

coincidence