in fuzzy search
Fuzzy search is similar to standard search, with the exception that it compares and sorts all field values according to their degree of resemblance to the search string. Fuzzy search is especially useful in situations where misspelling is an issue. It can also help you find multiple values that are nearly identical to each other.
When a fuzzy search is made, a tilde " ~ " -character is displayed in front of the search string.
If starting a text search with a tilde " ~ " -character, the text search window will be opened in fuzzy search mode. The search window will contain the tilde with the cursor placed after it. When typing, all values will be sorted by the degree of resemblance to the search string, with the best matches at the top of the list. If Enter is pressed, the first value in the list will be selected.
for wildcard
normal search: normal search aims to free the user from typing wildcard characters. Normal mode equates to searching for any string in the target that begins with the typed characters. So typing 'ba' in Normal mode actually executes a 'ba*' search. Further Normal Mode also OR's values separated by spaces. So typing 'ba ab' as your search string in Normal Mode is equivalent to 'ba* OR ab*'. Why the change? Well in most search engines today you dont ask your users to use wildcard characters, you just want them to search for what they know. And that is what we've gone for with V10 search.
for widcard see http://qlikshare.com/tag/wildcard-search
also refer the below link
The Search String
