You search using the prefix and wildcard %. See examples in the iStore implementation guide Chapter 7 and section "7.9.3 Special Characters and Reserved Words in the Search".
If category search profile is enabled the user can choose the category in the search dropdown and will be restricted to that specific category.
If we will use product autoplacment program and add products to sections by using this method then is that is the reason we can not use search. As when i added items manually the search was working but used product autoplacment as items was more.
All the profile option are set but still search is not working. Please let me know.