YOU SAID:

They should not have come here

INTO JAPANESE

彼らが持っているここに来ない

BACK INTO ENGLISH

Do not come here that they have

INTO JAPANESE

ここに来ていないことがあります。

BACK INTO ENGLISH

Do not come here.

INTO JAPANESE

ここへ来てはいけません。

BACK INTO ENGLISH

Do not come here.