Giúp đỡ! Tôi bị lạc
I wrote the same as you, but I was marked as incorrect.
Giúp đỡ means help as a noun. We can't use it here, which is saying: Help! Instead, we can use Giúp! or Giúp tôi với!
That's similar to what I wrote too. Giúp tôi! Tôi bị lạc
Apparently Giúp! alone also works. Would a native speaker actually shout out like this?
"Giúp với"? The last time I went through this module it was just 'giúp'