Two domain for one web site index problem

I have Two domains for one web site .eg skuraband.com & skura.com .set same DNS seeting for both domain.but i wanna promote only skuraband.com in Google first page .wht happned is skura.com now in second page of google search & skuraband.com in 450 in google .how can i get skuraband.com instead of skura into first page pls

Take down the content of skura.com and put up a 301 redirect from every page of skura.com to each matching page on skuraband.com. Then build some more links to skuraband.com. G will eventually transfer all the link juice to skuraband.com and it should rank.