You can use wildcard characters if you are not sure of the spelling of your search term to expand your search:
The asterisk is useful for matching terms with the same root or prefix. For example, if you are not sure how to spell zoopraxiscope, you can submit this query:
This query finds pages that match zoopraxiscope, as well as pages that match terms like zoophyte and zooplasty. Once you have found the correct spelling of zoopraxiscope, you can submit a new query to limit the search to the pages that interest you.
The question mark is useful to substitute for characters in a particular position in a term. For example, if you are searching for a document referring to someone named Fleiss but you are not sure if the name is spelled Fleiss or Fliess, use this query:
The search engine finds pages that contain either Fleiss or Fliess.