When using the on-line census one not only has to deal with poor transcriptions (I'm sure someone looking for Senogles will never think to try Smork) but also you have to enter additional information as it appears in the census.

Watch Maker is not the same as Watchmaker

Conchan and Onchan are not the same to the computer.

While looking for a lady born in the Channel Islands using Channel Islands in 'where born' box produced nothing, neither did St Helier (where she was born) but Jersey finally found her as her birth place was recorded as Jersey St Helier.