Just enter the term as you would normally expect to see it written. Case (capitalisation) and punctuation (spaces, hyphens, etc.) is generally not significant. A few entries differ from each other only in case or punctuation so if you just enter lower case and no punctuation you may get one or two more hits, never less, than if you enter the term exactly as it appears in the entry.
If you feel there is a kind of advanced search it would be really useful to be able to do, please let me know.