The Toffees had been set to sign FC Twente midfielder Leroy Fer until the deal collapsed on Wednesday, with the Dutch side refusing to accept restructured payments after Fer's medical highlighted an issue.
A move for Sevilla striker Alvaro Negredo also proved fruitless before Everton managed to complete the capture of England Under-19 right-back John Stones from Barnsley.
That was the club's only new recruit during January and Moyes - who also extended midfielder Thomas Hitzlsperger's stay at Goodison Park a few weeks ago through to the end of the campaign - has made it clear that he would have liked to get more players in.
But the Scot was also keen to emphasise that he has plenty of faith in his current squad, who head into Saturday's Barclays Premier League home clash with Aston Villa still very much in the hunt for a top-four finish.
Moyes said: "We would obviously like more, but what the players have done up to now has meant that we are more than confident going into the rest of the season with what we have got. Yes, we would have liked to add to it, but it wasn't to be the case.
"We wanted to add players if we could who could go into the team and we tried to do that right up to the end, but for reasons out of our control it didn't happen. It wasn't for the want of trying, that is for sure.
"There were a couple of young players we were interested in and we took one of them in John Stones in the end.
"But a couple of targets we had in mind possibly for helping the first team right now, they were gone, probably a few days before (deadline day).
"We tried (for Negredo), but it didn't work. They wanted a lot more money than we offered."