"Metra" could be "meter" in Serbian. "Iznad neba" translates to "above the sky", and "deo" means "part" or "section". So putting that together, maybe the user is referring to a "3-meter section above the sky" and another "3-meter part online with translation".
They might be using incorrect translation terms or the terms are in the wrong order. The "+" signs are probably just separators, but the user might be combining words from different languages. So the task is to interpret the mixed language query and provide the correct resource. 3+metra+iznad+neba+3+deo+online+sa+prevodom
I should verify if "3 metra iznad neba" is a known title in Serbian literature or media. Searching online, yes, there's a book by that name by Vladimir Rakin, a Serbian author. It's part of a series called "Podravina". If there's a series, part 3 might be available, but the user is struggling to find an online source with translation. "Metra" could be "meter" in Serbian