How can a person change their career track?

Okay, here it is. I was a second shift janitor, for 15 years (and my clients said I was very good at the job). Now the problem. Due to being diagnosed with Chronic Asthma, my lung cannot take chemical fumes, any-longer. If I go back into janitor work, it will mean more hospital visits, or worse. I am, fairly good, with the basic use of computers, but I dont know Cobol from Excel, PowerPoint, etc. I am trying to get out of manual labor, and move into work, which will not cause breathing problems. My job coaches, and I have spent most of the past year trying to think of the names that companies use for workers, who perform data entry, for them. I have tried Data Input Operator, Data Entry Keyer, and several others. The problem is that, no matter which term I use, even on search sites, like Monster, and Yahoo HotJobs, all I get are referrals to become a ';Work-from-Home'; person. What am I doing wrong? What search terms should I use, for a person who needs to change careers, yet they dont know what words, phrases, and sites, to use, for this career change. Any suggestions????How can a person change their career track?
First off, if you're looking for IT jobs, might try Dice.com, which specializes in that area. Also, if you're looking for freelance data entry work, might try sites like getafreelancer, guru or sologig as they often have many (tho the work/pay ratio is pretty high unless you have tools to make it easier...for example, a lot of those involve gathering info from websites...a good screen-scraper app can make things immeasurably simpler.)