「不得其法」

(pos:語句)
<explanation>
yue:做嘢冇用到啱嘅方法
eng:to fail to use an appropriate method to accomplish a task
<eg>
yue:佢讀書好勤力，不過不得其法，始終都進唔到步。 (keoi5 duk6 syu1 hou2 kan4 lik6, bat1 gwo3 bat1 dak1 kei4 faat3, ci2 zung1 dou1 zeon3 m4 dou2 bou6.)
eng:He is very hard working in his studies, but since he did not use a right method, he was unable to improve.