look for，hunt for和 search for有什么区别

look for 寻找、期待
I am looking for my book

hunt for 搜寻
He is on the hunt for lodgings.
他正在搜寻住所。

search for 搜索、搜查
We search for five hours and all for nothing.
我们搜索5个小时，但毫无结果。