idiom > Get to the bottom of sth. Request source
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追根求源
Pinyin: zhuī gēn qiú yuán

Explanation: 指追溯事物发生的根源。同追本溯源”。

Source: 张周《步履艰难的中国》第四章追根求源，倒溯黑幕，岑长进现出了面目。”

With the "go back"
　　With "trace to its source."
　　Zhang Zhou, "China gets tough," Chapter IV: "The source of shady back down, grow Cen face became visible."
Translated by Google