With the help of a so-called wildcard you can look for several search words, which have the same word beginning. If you search e.g. for "Typo*", the search will find everything that begins with "Typo" : Typo3, Typoscript, Typocode, Typo3user... etc.
If you do not want to find certain expressions in your search result, you can cause this with placing a hyphen in front. Terms containing this phrase are excluded from the search result.
Search for user
It is possible to limit the search result on answers of certain users. In addition to the retrieval query attach still another "user:username" and find the results, which were written by this certain user. If the username could not be found this will be ignored.