I guess you should be able to use the same wildcard codes that were usable in Windows 7 since the "type to search" feature is nearly identical in both. Here's a link that describes some of the codes. It describes wildcards and search codes.
An extract from the site
This option has been with us since the earliest days of DOS and
Windows and consists of two wildcards: ‘?’ and ‘’ (without the single
quote marks). The simplest explanation to what the two different
wildcards do boils down to this: the ‘?’ means one character appears
here and the ‘’ can stand for any number of characters – letters or
So if you are using the ‘?’ and you are searching for a file that you
know part of the name of your query could look like this fo??t which
would return any file that started with fr and ended with a ‘t’ but
only had two unknown letters in the middle. In this case the file
foxit could be one of the search results.
When using the ‘*’ as part of the search term it is best to use it
either at the beginning of the word – it – or in the middle – ft –
in either case the file named foxit would be returned as part of the
results. As for using the ‘*’ wildcard at the end of the search term
there isn’t much of a point because Windows search always acts like
there is a wildcard at the end.
The one thing about the way I usually end up doing searches is that I
typically end up with way more results than I really need. The way
around this happening is to use search shortcuts – or codes – to
further refine what you are searching for.
The simplest of these is the document types short codes. For example
you are searching for a specific image but you forget its name but
remember that it is a JPEG (jpg) image. In this case you can use the
following short codes to refine your search
UPDATE: Also check out this site: http://www.7tutorials.com/basics-making-advanced-searches-wildcards-and-filters