A national group, Texas EquuSearch, Ohio Chapter, led Saturday's efforts south of Canton.
The group, using volunteers on foot, search dogs and ATVs, searched 10 square miles south of Route 672.
"We don't want to give up," David Rader, director of the Ohio Chapter of Texas EquuSearch, said.
Saturday's search marked the third time Texas EquuSearch has looked for Slinger.
Police say Slinger's ex-boyfriend shot and killed himself after being interview by law enforcement.
Slinger's 28th birthday was Dec. 1.
Rader said while past searches haven't turned up any clues, they're hopeful they can give some answers to the Slinger family. As the group plans to search an area where Slingers' ex-boyfriend's cell phone pinged after her disappearance.
"We just wanted them to know that we're not going to give up. We're going to do everything we possibly can to bring her daughter home," Rader said.