Are search engines always useful

they are most of the time useful, but some times when you cant find something it is annoying.

truly said main thing is that u must know n u should be aware of what u want...so u have to use ur own brains in categorizing things according to what u have searched...!!they r helpful to us alot..but they cant be like human brain so u have to analyse the things n u must be accurate in those things what u r looking for..!!