Others cannot. When you're posting a job opening, and the online job board asks you for a list of keywords, you might want to add in a couple of misspellings. That way, you'll get a few extra hits from some potentially worthy candidates who may have made a typo.
For example, if you want to attract people who might search and misspell your company name, try listing the keywords McDonald's, McDonalds, MacDonald's and MacDonalds, or whatever the case may be.
One corollary tip: If applicable, keep in mind that in some countries, English words like Organization may be spelled differently.
Source: Weddle's (online recruiting newsletter), June 1, 1999.