CRM 4.0 set lookup search to like clause instead of equals

Hi,

This may be a basic question, so please forgive!

In CRM 4.0 within our cases we have a lookup field for Accounts, when searching within this lookup for an account, the clause appears to be equal as opposed to a like, as I'd expect in a search.

So for example if I have account, "hello world" & I want to pick this account in the lookup field, I can't search for world, I have to search for the term at the beginning of the account name, so hello. I was just wondering if anyone is aware of a way to get the search to perform on a like clause instead of an equals clause (excuse my SQL comparison).

Thanks