Typos are common, and for the most part when searching with google or bing, people don’t even go back to correct them. Google has been smart enough for a long time to guess what you meant correctly most of the time. The adwords keywords however are based on exact (but not case sensitive) matches to the search terms. This is a time for software help.
- http://tools.seochat.com/tools/online-keyword-typo-generator/#sthash.v8gWUKV1.dpbs: This tool will take your keyword list and generate a list of words containing the most likely typos.
I haven’t tried this yet but I intend to modify my bing ads campaigns using this data.