I am using nop commerce for books store.But the customer want to search by author or by book name or by most viewed.So how can i edit the search functionality in nop commerce ?
(you should mention which version of nopC you're using)
How are you storing Authors? I've seen another post where they mention they are using Manufacturer to store Author. You could then use the advanced Search. (and use Admin/Config/Languages to change "Manufactturer" to "Author")
There is no option for most viewed. That would require customization.