Are 'tất cả' and 'mọi thứ' interchangeable?
This sentence is very interesting.
Usually we don't use verbs (like "to be") with adjectives. But here, with để, we need a verb, we cannot say "in order to happy". Then we use the verb for passive, which is not "là" but "được".
Is there a difference between feeling happy and being happy, given that happiness is a feeling?