It's never known as "Concepci?n", just La Vega.
I know most Dominican cities have longer official names but try going to a bus station and asking for departures to the following cities:
What I like about Concepcion is being close to Santiago and Jarabacoa without the crowded scene of Santiago and the too small or high class of Jarabacoa .
San Jose De OcoaChiri, I think I'd add San Jose to that list. I've never heard a Dominican say anything except Ocoa.
AE