How should I use ‘不知何故’ when speaking Mandarin?
I know it means 'somehow', but I'm not sure if I can use it in the same way as 'somehow'.

Question

Answer

“不知何故”means "Don't know the reason",so when "somehow"means"for some reason",they are the same.
But when "somehow"means "by some means",its different from“不知何故”。

Answer

知=知道
何=什么
故=原因
不知何故=不知道什么原因=不知道为什么=不知道怎么回事

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结婚前的几天，她的未婚夫不知何故突然失踪了。

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just mean "don't know why" “someway" or "why".you can think about when would  you use the word.you can use "不知何故"in the same way

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举个例子：
1他原本身体棒棒的，不知何故，现在他一病不起。
2他向来每会必到，不知何故，今天他未能参加会议。
3不知何故养鸡场的鸡一只接一只地快死光了，人们恐慌起来，说是要闹瘟疫了。
1,2, 不知何故相当but， although, however.3 不知何故相当于why

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