The only way to find a lost snake is to keep looking I'm afraid. There is no other magical way to find them.
Another hatchling will not attract the lost one. Also, be careful as if you buy another hatchling and the one you have lost turns up, you will then have the problem of housing two snakes. The majority opinion is that snakes should not be housed together (unless done so by a very experienced keeper who is willing to take the risks involved).
Don't give up on your hatchling yet. Corns are the most robust of snakes. There have been stories of adult corns turning up again after 6+ months.