Need help improving online search feature

My website is <[login to view URL]> the search bar is in the top right corner I want to improve the search results it gives anyway possible when someone types in something that it cant find it goes to an error page I would like it to give suggestions on mispellings and products that it cant find or at least show the closest match that is the main issue im concerned with also any other suggestions to implement on giving better results would be appreciated. ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform ie 6.0 +