hey guts in the know about buying a house...

if a deal have been accepted by the sellers… and the buyers are waiting to get financed… can i still go in and place a bigger bid… and have the seller accept mine as well? i mean like say i go 5k over what the other people are offering… can the seller cancel the other bid to accept mine and wait for me to get financed… i have no clue… just trying to get an idea here.