python字符串中的逻辑运算符

I know this question is too much basic, but I am unable to understand it. For example, if have to search any of N words in a string, how can I do this. I tried logical operations.

('browser' or 'chrome') in 'start game'

它将返回false。

('browser' or 'chrome') in 'start chrome'

它将返回True。

('browser' or 'chrome') in 'start chrome'

This should return True, but it returns false. chrome word is in the string, so why it returns false.

('browser' and 'chrome') in 'start chrome'

这将返回True。但是为什么即使只有一个单词匹配也返回true。

我想返回True,即使一个单词匹配,无论它在哪个索引上。