I think you can only do it if they show up on the keyword tool.
Tropical Island
11:10 am on May 3, 2005 (gmt 0)
We bid on many mispellings. Don't forget words that normally have a space. e.g. New York - cover newyork
bin82878
8:19 pm on May 3, 2005 (gmt 0)
We have had great results bidding on misspellings. And don't forget slang terms, shortened words and abbreviations. Some of our best results have come from shortened words and slang.