The asterisk * and the question mark ? can be used as wildcards for the search.
The asterisk * is used to replace zero, one or several characters:

For example, it allows to search for culture, cultures, cultural etc.
Note: for technical reasons, searching with an asterisk at the end can return less results when using swisscovery plus scope.
The asterisk * can also help to find different spellings:

searches for yogurt, yoghurt, yogourt, yoghourt, etc.
The question mark ? is the wildcard for replacing one single character:

searches for both woman and women.
You can also combine these two characters:

You'll get results with yoghurt, yogurt, yoghurts or yogurts.