This movie(A) is not more(B) interesting as the one(C) we saw(D) last week
→ This movie is not more interesting than the one we saw last week.
Correction: Replace "as" with "than" for correct comparison.

Hieu is(A) more interested(B) in rock and roll as(C) his classmates are(D)
→ Hieu is more interested in rock and roll than his classmates are.
Correction: Replace "as" with "than" to make the comparison correct.

The author(A) of this novel(B) is the same like(C) that one(D)
→ The author of this novel is the same as that one.
Correction: Replace "like" with "as" in comparative structures.

The concert show(A) was quite(B) different than(C) what I though(D)
→ The concert show was quite different from what I thought.
Correction: Replace "than" with "from" for correct comparison, and fix "though" to "thought."