Search engine goes wrong for me

Question

How to explain it works for only 2nd, 5th and 6th case ?
text = (input())
word = (input())
def search(text, word):
text=text.split('""')
word=word.split('""')
if word in text:
return "Word found"
else :
return "Word not found"
print(search(text,word))

Answer 1

You do not need to split anything.

Answer 2

That's right