You can use * as a 'wildcard' to represent any number of characters.
So searching on show* will find show, shows and showman.
You can use the * at the beginning or at the end of a word.
So *show will find airshow.
You can use the * at both ends of the word.
So *show* will find airshow and airshows.
You can search using more than one word.
If you do use more than word, the search will find those words as a phrase, but not as individual words.
So searching for air show will find the phrase air show, but will not find air or show on their own.