What's the difference between tady and sem?
position and direction, here and hither
Přinesou není možný?
That is "are going to bring him".
What's wrong with "Dva chlapci jeho sem nesou"?
You need the short "ho" in the unstressed second position.
Dva kluci nesou ho sem?
Please ask an actual question when asking, do not just give us a sentence and a question mark. Sometimes it is really unclear what is your question.
Your word order is wrong, because ho must be in the second position.
Dva kluci ho tady nesou....... Neuznalo
You can't use "tady" for a direction. It works in some Moravian dialects, but not in standard Czech.
"Tady je." / "Nesou ho sem." / "Nesou ho odsud."