www.live.com.  There are different algorithms to solve a problem.  One of them is always the best.  Speed, space and userfriendliness is
important. 

Search Engine Software.

http://www.mtopsoft.com/sitesearch/

To create a text box in html is not difficult.  In C++ and visual basic we use text box.  In html we use input.

Once you have the text box, you enter the desired search terms.

Line 8 is the interface.

Line 9 accepts it.